Aitchison, Jean, 1938-
Language change : progress or decay?
Cambridge University Press, 2001
 Buku Teks SO
Aitchison, Jean, 1938-
Language change : progress or decay?
Cambridge University Press, 2013
 Buku Teks SO
Keller, Rudi
On language change : the invisible hand in language / Rudi Keller
Routledge, 1994
 Buku Teks SO
Heine, Bernd
Language contact and grammatical change
Cambridge University Press, 2005
 Buku Teks SO
Motives for language change
edited by Raymond Hickey
Cambridge University Press, 2004
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