Phonology and language use / Joan Bybee
Cambridge University Press, 2001
 eBooks
Heine, Bernd
Language contact and grammatical change/ Bernd Heine and Tania Kuteva.
Cambridge University Press, 2005
 Buku Teks
Kaplan, Abby
Women talk more than men : --and other myths about language explained
Cambridge University Press, 2016
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Brown, Penelope
Politeness : some universals in language usage
Cambridge University Press , 1987
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Jones, Mari C.
Exploring language change
Routledge , 2006
 Buku Teks