Nevid, Jeffrey S.
Pearson Education International, 2008
Buku Teks
by Lawrence W. Scott [and others]
Burgess, 1976
Buku Teks
Altschuler, Bruce E., author
Prentice-Hall, 1996
Buku Teks
Farrell, William R., author
Quorum Books, 1999
Buku Teks
Halpern, Joel M., author
Prentice-Hall, 1967
Buku Teks