Christopher, Dawson
Progress and religion: an historical enquiry
Catholic University of America Press, 20001
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Lehmann, Winfred P.
Historical linguistics: an introduction
Holt, Rinehart and Winston, 1962
 Buku Teks
The handbook of historical linguistics
editor, Brian D. Joseph, Richard D. Janda
Blackwell Publishing, 2006
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Lehmann, Winfred P.
Historical linguistics : an introduction
Holt, Rinehart & Winston, 1973
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Campbell, Lyle
Historical linguistics : an introduction
Edinburgh University Press , 2013
 Buku Teks SO