Wolfram, Walt, 1941-
American English: dialects and variation
Wiley Balckwell, 2016
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Dialects of English : studies in grammatical variation
edited by Peter Trudgill and J.K. Chambers
Longman, 1991
 Buku Teks SO
Dialects of English : studies in grammatical variation
edited by Peter Trudgill and J.K. Chambers
Longman, 1991
 Buku Teks SO
Jaschke, H.A.
Tibetan-English dictionary : with special reference to the prevailing dialects
London : Routledge & Kegan Paul Ltd., 1949.
 Buku Teks
Jaschke, H. A.
A Tibetan-English dictionary with special reference to the prevailing dialects
Trubner and Co. Ludgate Hill, 1882
 Buku Referensi