Elliot Aronson...[et al.]
McGraw-Hill , 1990
Buku Teks
Bank, Marcus, author
Sage Publications, 2001
Buku Teks
Dunn, Dana S., author
Wiley-Blackwell, 2009
Buku Teks
Crano, William D., author
Lawrence Erlbaum Assossiate, 2002
Buku Teks
by Claire Selltiz [and others]
Holt, Rinehart and Winston, 1959
Buku Teks