International Encyclopedia of Linguistics (online) by William J. Frawley- This link opens in a new window
Publication Date: 2003 (2nd ed.)
Coverage of contemporary linguistics, including historical, comparative, formal, mathematical, functional, and philosophical linguistics with special attention given to interrelations within branches of linguistics and to relations of linguistics with other disciplines (sociolinguistics, psycholinguistics, etc.) and along with interdisciplinary work in language and literature, and more.