Olds, Linda E., author
State University of New York Press, 1992
Buku Teks
Brennan, James F., author
Prentice-Hall, 1991
Buku Teks
Wrightsman, Lawrence S., author
Brooks/Cole, 1991
Buku Teks
Krech, David, author
McGraw-Hill, 1948
Buku Teks
Slavin, Robert E., author
Paramount Publishing, 1994
Buku Teks