Buku Teks
Busey, James L., author
Random House, 1968
Buku Teks
edited by Juan J. Linz and Alfred Stepan
John Hopkins University Press, 1978
Buku Teks
edited by James Petras
John Wiley & Sons, 1973
Buku Teks
Burns, E. Bradford, author
Prentice-Hall, 1977
Buku Teks