American Psychological Assosiation, 2004
Majalah, Jurnal, Buletin
Collins, Barry E., author
John Wiley & Sons, 1964
Buku Teks
Dunn, Dana S., author
Wiley-Blackwell, 2009
Buku Teks
BPS Blackwell, 2004
Buku Teks
Elliot Aronson...[et al.]
McGraw-Hill , 1990
Buku Teks