Ottenheimer, Harriet Joseph
Wadsworth and Cengage Learning, 2013
Buku Teks SO
Ottenheimer, Harriet Joseph
Cengage, 2013
Buku Teks SO
Trudgill, Peter
Penguin Books, 1995
Buku Teks SO
Cambridge University Press, 2006
eBooks
Ahearn, Laura M. author
John Wiley & Sons, Incorporated,, 2016
Buku Teks SO