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The concise Oxford dictionary of linguistics
P.H. Matthews. [Oxford] : Oxford University Press, 2007-
A dictionary of linguistics and phonetics
David Crystal. Malden, MA ; Oxford : Blackwell Pub., 2008.
Encyclopedia of language & linguistics
2nd ed. Brown, Keith, ed.-in-chief. 14 v. Amsterdam, London : Elsevier, 2006.
"Comprehensive reference information for the world's languages," including a bibliographic index.
Indo-European Etymological Dictionaries Online
Lexicon of the most important languages and language branches of Indo-European, including Latin, Greek, Slavic, Proto-Celtic, Old Frisian, Armenian, Hittite, Luvian, the Iranian verb and Proto-Nostratic.
International Encyclopedia of Linguistics
Includes 850 entries of articles on most areas of linguistics, including historical, comparative, formal, mathematical, functional, philosophical, and sociolinguistics.
Oxford English Dictionary (OED)
Most authoritative and comprehensive English language dictionary, especially helpful for providing dates and quotations for the earliest instance of each sense of a word. Includes information on the English language, its history, and the social, cultural, and political influences that have shaped the language through the centuries. Includes Historical Thesaurus.