Solso, Robert L., 1933-, author
Pearson/A and B, 2005
Buku Teks
Galotti, Kathleen M.
Brooks/Cole, 1999
Buku Teks
John Wiley & Sons, 1988
Buku Teks
Bjorklund, David F., author
Wadsworth and Cengage Learning, 2012
Buku Teks
Bourne, Lyle E., Jr.
Prentice-Hall, 1986
Buku Teks