Heine, Bernd
Language contact and grammatical change/ Bernd Heine and Tania Kuteva.
Cambridge University Press, 2005
 Buku Teks
Aitchison, Jean, 1938-
Language change : progress or decay?
Cambridge University Press, 2013
 Buku Teks
Aitchison, Jean, 1938-
Language change : progress or decay?
Cambridge University Press, 2001
 Buku Teks
Keller, Rudi
On language change : the invisible hand in language / Rudi Keller
Routledge, 1994
 Buku Teks
Language, usage and cognition / Joan Bybee
Cambridge University Press, 2010
 eBooks