Davies, John W
Prentice-Hall, 2001
Buku Teks
O`Shaughnessy, Douglas, 1950-
Addison-Wesley, 1987
Buku Teks
Kathryn Dindia, Steve Duck, editor
John Wiley & Sons, 2000
Buku Teks
Wood, Julia T., 1950-
Wadsworth and Cengage Learning, 2013
Buku Teks
Wood, Julia T., 1950-
Salemba Humanika, 2013
Buku Teks