editor, David F. Marks
Sage Publications, 2002
Buku Teks SO
Brenner, Charles
Anchor Book, 1973
Buku Teks SO
Basch, Paul F.
Oxford University Press , 1999
Buku Teks
W.B. Saunders, 1999
Buku Teks
The American Psychological Association,
Majalah, Jurnal, Buletin