Newby, Michael
The structure of English : a handbook of English grammar
Cambridge University Press, 1988
 Buku Teks SO
Simpson, David
The politics of American English, 1776-1850i
Oxford University Press , 1986
 Buku Teks SO
Kenyon, John Samuel
A pronouncing dictionary of American English
Merriam-Webster ; G. & C. Merriam Co., 1953
 Buku Referensi
Lutz, William D.
The cambridge thesaurus of American English
Cambridge University Press, 1994
 Buku Referensi
Wolfram, Walt, 1941-
American English: dialects and variation
Wiley Balckwell, 2016
 Buku Teks SO