Le Roy, Michael K.
Wadsworth and Cengage Learning, 2013
Buku Teks SO
Fisher, Ronald A.
Oliver and Boyd, 1950
Buku Teks SO
Coolican, Hugh
Psychology Press, 2014
Buku Teks SO
Coolican, Hugh
Hodder & Stoughton, 2009
Buku Teks SO
Weiss, Robert S.
N.Y. Wiley , 1968
Buku Teks SO