Floyd, Kory, author
Mc Graw Hill, 2012
Buku Teks
Hartley, Peter, 1946-, author
Roudledge, 1993
Buku Teks
Condon, John C., author
Macmillan, 1977
Buku Teks
Knapp, Mark L., author
Allyn and Bacon, 1996
Buku Teks
Wood, Julia T., 1950-, author
Wadsworth and Cengage Learning, 2013
Buku Teks