Enos, Matthew, author
Wadsworth, 2002
Buku Teks
by Richard R. Bootzin [and others]
Mcgraw-Hill , 1991
Buku Teks
Atkinson, Rita L., author
Harcourt Brace College, 1996
Buku Teks
Coon, Dennis
Brooks/Cole, 1998
Buku Teks
Reeves, Joan Wynn, author
Penguin books, 1958
Buku Teks