Background sources such as, but not limited to, dictionaries and encyclopedias provide context for your topic or even help you choose one. Researchers use them when they need:
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Encyclopedia entries from McGraw-Hill's Encyclopedia of Science & Technology. Also includes biographies of well-known scientific figures, downloadable images, videos and animations illustrating key topics. Coverage: Latest edition.
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Encyclopedia, dictionary and biographical entries from hundreds of sources for most subject areas. It includes images, diagrams, maps and photos, and audio pronunciation files and sound clips. Coverage 2000 – present.
This link opens in a new windowEncyclopedia and dictionary entries for most subject areas. Dates covered: latest edition of each title.