Marcus, Edward, author
Pitman, 1965
Buku Teks
Beck, Ulrich, author
Malden, MA :Polity Press, 2005
Buku Teks
edited by Charles F. Herman, Charles W. Kegley, James N. Rosenau
Harper Collins Academic, 1987
Buku Teks
Unesco, 1976
Buku Teks
Pergamon Press, 1980
Buku Teks