Andrain, Charles F., author
Macmillan, 1995
Buku Teks
McRobert, Kenneth
McClelland and stewart, 1976
Buku Teks
Halpern, Manfred, author
Princeton University Press, 1963
Buku Teks
edited by E.K. Fisk
Australia National University, 1966
Buku Teks
edited by George W. Albel, Justin M. Joffe and Linda A. Dusenbury
Sage, 1988
Buku Teks