Ashton, Michael C.
Individual differences and personality
Academic Press, 2013
 eBooks
Mahoney, Bere
Personality and individual differences
Learning Matters, 2011
 Buku Teks SO
Personality social skill, and psychopathology: an individual differences approach
edited by David G. Gilbert and James J. Connolly
Plenum Press, c1991
 Buku Teks
Burger, Jerry M.
Introduction to personality
Wadsworth and Cengage Learning, 2011
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Viaud, Gaston
Intelligence: its evolution and forms
Hutchirson, 1968
 Buku Teks SO