Weinberger, Paul E., author
Macmillan, 1974
Buku Teks
Weinberger, Paul E., author
Macmillan, 1969
Buku Teks
Greenwald, Michael L., author
Longman, 2002
Buku Teks
edited by S.N. Eisenstadt
Little, Brown and Company, 1968
Buku Teks
Deutsch, Morton, author
Yale University Press, 1985
Buku Teks