Knudson, Harry R., author
Winthrop, 1978
Buku Teks
Greenwood, William T., author
South Western, 1965
Buku Teks
Gerloff, Edwin A., author
McGraw-Hill, 1985
Buku Teks
Kolb, David A., author
Prentice-Hall, 1991
Buku Teks
Myers, Michele Tolela, author
McGraw-Hill, 1982
Buku Teks