Encyclopedias contain full coverage of information about an area of knowledge. They can be general or can cover a specific subject, and contain alphabetically organized entries with varying detail. These are great starting points for fact-finding, getting background topic information, learning of key events and individuals, or starting a research project. Below is a major general encyclopedia. See Best Practices on this guides Home page to pinpoint valuable subject-specific encyclopedias.
Standard dictionaries give an alphabetical list of words and their definitions, but there are several useful variations also classified as dictionaries. Thesauri contain synonyms and antonyms (opposites) but usually don't define the words. There are also dialect and slang dictionaries, dictionaries of abbreviations and acronyms, dictionaries of quotations, and picture dictionaries. Dictionaries can be unabridged (general) or can be thematically organized in some way.
