Malmstrom, Jean
Dialects USA
National Council of Teachers of English , 1963
 Buku Teks SO
Wolfram, Walt, 1941-
American English: dialects and variation
Wiley Balckwell, 2016
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Upton, Clive
An atlas of English dialects
Routledge, 2006
 Buku Referensi
The dialects of modern German: a linguistic survey
edited by Charles V.J. Russ
Routledge, 1990
 Buku Teks SO
Dialects of English : studies in grammatical variation
edited by Peter Trudgill and J.K. Chambers
Longman, 1991
 Buku Teks SO