Barret, Richard L., author
Charles E. Merril, 1965
Buku Teks
Bettelheim, Frederick A., author
Harcourt Brace Jovanovich College, 1991
Buku Teks
McClintic, J. Robert
John Wiley & Sons, 1976
Buku Teks
Watson, Juanita, author
Davis, 1995
Buku Teks
Reilley, Charles N.
McGraw-Hill, 1961
Buku Referensi