Buku Teks
Bartholomew, David J., author
John Wiley & Sons, 1982
Buku Teks
edited by Allen M. Omoto
Lawrence Erlbaum Associates, 2005
Buku Teks
edited by Michael A. Hogg and Deborah J. Terry
Psychology Press, 2001
Buku Teks
Scott, W. Richard, 1932-, author
Holt,Rinehart and winston, 1970
Buku Teks