Clinard, Marshall B. (Marshall Barron)
Sage Publications, 1985
Buku Teks
Feis, Herbert
W.W. Norton, 1967
Buku Teks
Monks, Robert A.G., 1933-
Blackwell, 2001
Buku Teks
Prochonow, Herbert V.
Prentice-Hall, 1950
Buku Teks
Clark, Robert C.
Little, Brown, 1986
Buku Teks