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Astrophysics Research Guide: Citation Searching

Web of Science (1900+)

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Web of Science is the most complete and comprehensive citation tracking database with coverage from 1900 to the present. It provides thorough coverage of thousands of major journals. Includes cited author searching. Abstracts, keywords, and additional subject categories are included and searchable.

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Scopus (1996+)

Provides International coverage of journal articles, selected web sites, and patents in the sciences and social sciences; provides citation tracking from 1996 to the present.


Google Scholar


Google has a specialized interface for searching the journal literature called Google Scholar that provides access to peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations. Although it is not as standardized, thorough, or reliable as BIOSIS, Web of Science and other literature databases, Google Scholar is the simple interface that has its advantages of those who are less experienced with searching the literature.

To access full-text articles from Princeton University Library through Google Scholar, be sure to add Princeton University to your library settings in Google Scholar. Go to Google Scholar -> Settings -> Library Links and then search for Princeton University. Check the boxes and save settings.