Berry, Brian J.L., author
ST Martin's Press, 1973
Buku Teks
Edited by Wilbert E. Moore and Neil J. Smelser.
Prentice-Hall, 1966
Buku Teks
edited by Philip M. Hauser
Unesco, 1961
Buku Teks
Hance, William A., author
Columbia University Press, 1970
Buku Teks
Larsson, Gerhard, author
Avery, 1993
Buku Teks