Cole, George F., author
Brooks/Cole, 1986
Buku Teks
Adler, Freda
McGraw-Hill, 2007
Multimedia
Wormer, Katherine Stuart van, author
Allyn and Bacon, 2000
Buku Teks
Alpert, Geoffrey P., author
Sage, 1985
Buku Teks
Sheley, Joseph F., author
Wadsworth, 1987
Buku Teks