Chaplin, J.P., author
Rajawali, 2011
Buku Referensi
edited by Michael W. Eysenck
Blackwell , 1994
Buku Referensi
Raymond J. Corsini, editor
Wiley, 1987
Buku Referensi
Watson, Donald, author
Andre Deutsch, 1995
Buku Referensi
Fuad Hassan, author
[publisher not identified], [date of publication not identified]
Buku Teks