Matthews, Candace
Prentice Hall Regents, 1990
Buku Teks
Davies, John W, author
Prentice-Hall, 2001
Buku Teks
O`Shaughnessy, Douglas, 1950-, author
Addison-Wesley, 1987
Buku Teks
Kathryn Dindia, Steve Duck, editor
John Wiley & Sons, 2000
Buku Teks
Wood, Julia T., 1950-, author
Wadsworth and Cengage Learning, 2013
Buku Teks