Brown, Penelope
Politeness : some universals in language usage
Cambridge University Press , 1987
 Buku Teks SO
Sandler, Wendy
Sign language and linguistic universals
Cambridge University Press, 2006
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Bloomfield, Leonard
Language
Holt, Rinehart and Winston, 1961
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Sign language and linguistic universals / Wendy Sandler, Diane Lillo-Martin
Cambridge University Press, 2006
 eBooks
Language processing
edited by Simon Garrod and Martin Pickering
Psychology Press, 1999
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