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What is a Tertiary Information Source
These sources index, abstract, organize, compile, or digest other sources. Some reference materials and textbooks are considered tertiary sources whose chief purpose is to list, summarize or repackage ideas or other information. Tertiary sources are usually not credited to a particular author.
Examples include dictionaries/encyclopedias (may also be secondary), almanacs, fact books, Wikipedia, bibliographies (may also be secondary), directories, guidebooks, manuals, handbooks, and textbooks (maybe secondary), indexing and abstracting sources, research databases such as Statista.
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