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World factbook
CIA online world factbook includes a great deal of information about the geography, demographics, government, and economy of countries, territories and regions, including a basic outline map of each country.
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Ethnologue.com
An encyclopedic reference work cataloging all of the world's 6,912 known living languages.
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CNKI 工具书在线
内容包括汉语词典、英汉/汉英词典、专科辞典、百科全书、图录表谱、医学图谱。
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infoplease
This is a free online refer website to provide all the knowledge you need, which include encyclopedia, almanac, atlas, biographies, dictionary,
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