McRobert, Kenneth
McClelland and stewart, 1976
Buku Teks
Andrain, Charles F., author
Macmillan, 1995
Buku Teks
Moore, Wilbert E. (Wilbert Ellis), author
Prentice-Hall, 1963
Buku Teks
edited by Robert A. Nisbet
Blackwell, 1972
Buku Teks
edited with an introduction by Robert A. Nisbet
Harper Torchbooks, 1972
Buku Teks