Townsend, John C., author
McGraw-Hill , 1953
Buku Teks
Seidenberg, Bernard
The Free Press, 1976
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
edited by Mark P. Zanna
Academic Press, 1991
Buku Referensi