Beard, Adrian
Language change
Routledge, 2004
 Buku Teks SO
Chomsky, Noam
Language and mind
Cambridge University Press, 2007
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Chomsky, Noam
Language and mind
Cambridge University Press, 2007
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Language processing
edited by Simon Garrod and Martin Pickering
Psychology Press, 1999
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Diamond, Arthur Sigismund
The History and origin of language / A.S. Diamond
Methuen, 1959
 Buku Teks SO