Hickey, Raymond, 1954-
A dictionary of varieties of English
Wiley-Blackwell, 2014
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Bloomfield, Leonard
Introduction to the study of language by
Amsterdam John Benjamins Publishing 1983
 Buku Teks
Barber, Charles
The english language : a historical introduction / Charles Barber
Cambridge University Press, 1993
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Baka, Farida
Discourse structuring and text analysis of three varieties of english
Janus Publishing , 1988
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Sambrook, G.A.
English language
Longmans, Green, 1947
 Buku Teks