Thomson, Stephen
Prentice-Hall, 1989
Buku Teks
Greco, Thomas G., author
Pearson Prentice Hall, 2007
Buku Teks
Ouellette, Robert J., author
Macmillan, 1983
Buku Teks
Bettelheim, Frederick A., author
Thomson, Brooks/Cole, 2007
Buku Teks
Sousa, John J., author
Rhode Island Consortium, 1990
Buku Teks