American Psychological Assosiation, 2004
Majalah, Jurnal, Buletin
edited by Bettina P. Reimann
Nova Biomedical Books, 2007
Buku Teks
Dunn, Dana S., author
Wiley-Blackwell, 2009
Buku Teks
Elliot Aronson...[et al.]
McGraw-Hill , 1990
Buku Teks
Shibutani, Tamotsu, author
Prentice-Hall, 1961
Buku Teks