McDougall, William, 1871-1938, author
Macmillan, 1966
Buku Teks
Vaughan, Graham M., author
Pearson Prentice Hall, 2005
Buku Teks
Seidenberg, Bernard
The Free Press, 1976
Buku Teks SO
edited by Miles Hewstone, Wolfgang Stroebe, Klaus Jonas
John Wiley & Sons, 2012
Buku Teks
Bonnes, Mirilia, author
Sage, 1995
Buku Teks