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David Crystal The Cambridge Encyclopedia of Language Cambridge
University Press, 1987, ISBN 0-521-26438-3
David Crystal A Dictionary of Linguistics and Phonetics
Blackwell, 1985, ISBN 0-631-14081-6
William Bright, ed. International Encyclopedia of Linguistics
4 vols., Oxford University Press, 1992, ISBN 0-19-505196-3
R. E. Asher, ed. The Encyclopedia of Language and Linguistics
10 vols., Pergamon, 1994, ISBN 0-08-035943-4