Aitchison, Jean, 1938-
Language change : progress or decay?
Cambridge University Press, 1995
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Hazen, Kirk
An introduction to language
Massachusetts : Wiley Blackwell, 2015
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Language classification : history and method / Lyle Campbell and William J. Poser
Cambridge University Press, 2008
 eBooks
Hughes, John P.
The science of language: an introduction to linguistics
Random House, 1966
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Hughes, John P.
The science of language: an introduction to linguistics
Random House, 1966
 Buku Teks SO