Gerson, Sharon J., 1948-
Prentice-Hall, 1992
Buku Teks
Berner, R. Thomas
Allyn and Bacon, 1992
Buku Teks
Ewald, Helen Rothschild
Charles E. Merrill Publishing Company, 1983
Buku Teks
Davis, Ken
Charles E. Merrill Publishing Company, 1983
Buku Teks
Buku Teks