edited by Charles W. Kegley and Eugene R. Wittkopf
McGraw-Hill, 1992
Buku Teks
edited by Charles W. Kegley and Eugene R. Wittkopf
Random House, 1984
Buku Teks
Gill, Stephen, author
John Hopkins University Press, 1988
Buku Teks
Walters, Robert S.
Prentice-Hall, 1992
Buku Teks
Blake, David Haven, author
Prentice-Hall, 1983
Buku Teks