Greenberg, Florence Bonzer
The Bobbs-Merrill, 1967
Buku Teks SO
Steven, Laurence
Prentice-Hall, 1999
Buku Teks SO
Crusius, Timothy W.
McGraw-Hill, 2002
Buku Teks SO
Schorer, Mark
Harcourt, Brace Jovanovich, 1972
Buku Teks SO
edited by Jane A. Aaron
St. Martin's Press, 1987
Buku Teks SO