While you technically can cite pretty much anything in your research, there is a general expectation that certain sources of information are considered more "scholarly" than others. While this label is at times restrictive and not inclusive of diverse peoples and viewpoints, the idea of Academic Sources is that they go through a more rigorous process to be created and published--ultimately leading to what is a more reliable, high-quality source.
The process these sources go through still isn't fail-safe, though--even the most prestigious and selective journals have faced high-profile scandals and retractions. While the system isn't perfect, you can navigate it relatively simply with some specific tips.
To Start, if you use at least one of the methods in the Evaluation Techniques and Strategies section--particularly anything involving lateral reading--you'll be off to a good start. But there are some source specific considerations. This page focuses specifically on that including:
Evaluation Considerations: Using "Good" Journals | What Makes a Book "Academic" | Finding Reliable Data
Academic's Woes: Predatory Journals | Corrections | Retractions
Excluding all journals that aren't predatory, this answer can vary wildly depending on who you're asking. Instead of focusing on how "good" the journal is, first look over your assignment and ask yourself if the instructions mention any of the following things:
Outside of this general advice, determining what makes a journal "good" for you will be determined by it's fit with the topic you're researching. After all, if you're an art major researching the impact of Degas then chances are the newest issue of Nature (despite being a top journal worldwide) isn't going to be the best fit for you. But if you're working on a major project or paper, you may hear the following specifications:
These are more academic fail-safes: the more prestigious the journal and the more often it is cited, then (in general) the more likely the research is going to be high-quality and reliable.
Our advice if you believe this second set of questions is going to apply to your research:
With journal prestige and impact factors, there are likely issues here with inclusivity. For example, Chatterjee and Werner (2021) found that when women were the primary or senior author on a paper, then the paper was significantly less likely to be cited than if a man was the primary or senior author.
If you're interested in a largely un-researched topic mostly written about by authors from a demographic group who aren't as well-cited as others, then the situation could arise in which your sources may be reliable but could come into question. If you fall in this situation and have reliable sources already but are at all worried about this, have an open conversation with your advisor/professor. Sometimes they just need to hear thought-out, intelligent reasoning for the inclusion of the source(s).
Generally speaking, academic or "scholarly" books differ from other types of nonfiction books in that they are, among other things:
These are the main elements you are going to want to consider when evaluating whether or not a book would be considered academic or scholarly. Some other potential considerations:
There are a variety of factors that can impact whether or not a data set is both reliable. Some aspects of data reliability include:
Moreover, even if a data set is reliable, it may not be applicable to your research. Finding reliable and applicable data is an excellent conversation to to have with your subject librarian, but, to get you started on finding potentially reliable sources, take a look at the following links:
Essentially, predatory journals are journals that may appear scholarly--some have exceptionally similar names to legitimate trustworthy journals--but are focused predominately on profit and not on the rigor of the research they are publishing. In fact, they may misrepresent their peer review or editorial practices and hide information about their article processing charges, while actively soliciting articles from researchers. The quality of the information in the articles may vary dramatically, with several being of poor quality.
You've likely heard about predatory journals--or you're just now hearing about them and are realizing you have a whole new issue to worry about when you're evaluating your sources. For those of you who are publishing, I'd recommend you touch based with our Open Access and Intellectual Property Librarian (Matthew Kopel, mkopel@princeton.edu) and check out thinkchecksubmit.org. For those of you who are looking for valid information you may find yourself using a source in what you thought was a journal you trusted--but was just a journal with a extremely similar name. And then you found out that the article wasn't trustworthy either. So, how do you avoid this predicament?
You may have heard of predatory journal lists online. While there may be a sense of security in looking for what journals to avoid, the more important element of that work is in knowing what are warning signs. With that in mind, it is more important to know what makes a journal not predatory and what sort of standards such journals need to follow.
The Committee on Publication Ethics (COPE), The Directory of Open Access Journals (DOAJ), the Open Access Scholarly Publishing Association (OASPA), and the World Association of Medical Editors (WAME) put together the following standards for best practices and transparency in scholarly publishing:
COPE COAJ OASPA WAME. Principles of Transparency and Best Practice in Scholarly Publishing--English. https://doi.org/10.24318/cope.2019.1.12. 2022 COPE, DOAJ, OASPA, WAME
Scholarly publishers that are members or are indexed in these lists are likely to be committed to ethical standards or have well-documented publisher information:
Corrections occur post-article publication. While the policies differ from publisher to publisher, and even amongst publications (e.g., The Article Correction Policy for the journal Communications on Applied Electronics typically will only publish significant changes as Errata, Corrigenda and Addenda), typically Corrections from major publishers occur based on the following bases:
To see examples of these publisher policies, see the editorial policies of PLOS, Taylor & Francis, and Wiley.
Corrections are typically shorter pieces that may include edits that you should read in tandem with the original piece or that have already been applied to the original piece, depending factors that could range from anything to journal policy, the severity of the error, or whether or not the error was made on the side of the publisher or the author(s).
The process for indexing and publicizing corrected articles depends on the publisher. It's often the case that the journal or the larger publisher will include a correction notice or banner close to the top of the original article that links to a new, corrected version or to the published correction that lists how the online version has been amended from what it once was. For example, the online version article listed below was corrected from the original and a correction was released explaining the reason for these changes was due to a publisher error. The amended article contains a banner just underneath the citation information linking the reader to the correction:
Correction to: “Levothyroxine Absorption Test With the Daily Levothyroxine Dose in Patients With ‘Refractory Hypothyroidism.’” (2025). Journal of the Endocrine Society, 9(6), bvaf076. https://doi.org/10.1210/jendso/bvaf076
For publications that do not amend the original article This may now be listed in the journal with an amended title consisting of the original title with the addition of the word "Correction" or "Corrected". PLOS takes this approach with their publications, publishing corrections with the phrase "Correction" and the original versions of corrected articles with large, visible banners:

While corrections may not often show up in your database searches, if you click on an article and you see a banner stating that an article you're considering has been corrected, it's definitely worth your time to look into the correction before you proceed. You may find the correction alleviates some concerns you had with the original article.
Retractions occur when a published article is removed from a journal due to a significant concern or error. These errors include, but are not limited to:
While an investigation is taking place, journal editors may publish an Expression of Concern to indicate that a paper or sections of a paper may not be trustworthy or validated (See "Retractions: Their Effect on the Scholarly Record, and What's Being Done About It"), but this is not required while an investigation is ongoing or before a retraction takes place. An Expression of Concern May also be published as a stand-alone post-publication notice (See the publisher's notes for PLOS, Wiley, and Taylor & Francis) For more complete information on retractions, check out the following sources:
https://doi.org/10.24318/cope.2019.1.4 © 2019 Committee on Publication Ethics (CC BY-NC-ND 4.0) https://publicationethics.org
Walden University Library's "Journal Article Retraction" Research Guide
And to give some context about the actual state of retractions: Petrou, C. (April 18, 2024) Guest Post--Making Sense of Retractions and Tackling Research Misconduct. The Scholarly Kitchen. https://scholarlykitchen.sspnet.org/2024/04/18/guest-post-making-sense-of-retractions-and-tackling-research-misconduct/
If you'd like to see some papers that have been Retracted, their reasons for retractions, the journals they are in, and the ultimate outcomes of the papers, take a look at the following resources:
If in your research you find a retracted article, it may be amended similarly to a corrected article. While it likely won't be removed from the site itself, it's record will be amended. This will likely include a change in indexing so that it's title will now include the original title with the addition of some variation of "Retraction" or "Retracted". This will often be included at the beginning of the amended title, but may be added to the end. There may also be other indicators in the database or publication that the article you are considering has been retracted.
In Web of Science, your search result list are amended so that retracted publications will show up with the words "Retracted:" preceding the initial title. But in case you miss that, underneath the title you'll see a warning symbol (an orange outline of a triangle containing an orange exclamation point) followed by the word retracted. If you were to click on this article, you'd receive the same warning notice above the title and in the article's information section, under "Document Type" you'll see that Web of Science has now added the category of "Retracted Publication". and the publisher itself has made the retraction even more explicit

PLOS appears to rely more on the word "Retraction:" in their search results to get their message, although the article pages themselves do include a small warning label above the title similar to Web of Science. If you find a pre-retraction version of the article you'll see a clear warning banner alerting you to the retraction and its reason. If you try to download a PDF of a retracted article from their site--even the original version--you will see a large red watermark with the word "Retracted" spanning across each page. If you'd like to see an example:
In other words, if you pay enough attention to your databases and any accompanying warning signs (and perhaps don't try to just automate scraping results for your research when you shouldn't be...) then the chances are quite high that you'll notice a source has been retracted before you use it. But do make sure that you're paying attention to your search and the database and publisher context clues so you don't miss this important information.