Townsend, John C., author
McGraw-Hill , 1953
Buku Teks
Vaughan, Graham M., author
Pearson Prentice Hall, 2005
Buku Teks
edited by Miles Hewstone, Wolfgang Stroebe, Klaus Jonas
John Wiley & Sons, 2012
Buku Teks
Seidenberg, Bernard
The Free Press, 1976
Buku Teks
Junker, Buford H., author
University of Chicago Press, 1960
Buku Teks