Pierson, William W., author
D. Van Nostrand, 1953
Buku Teks
edited by Howard J. Wiarda, Harvey F. Kline
Westview Press, 2007
Buku Teks
Wynia, Gary W., author
Cambridge University Press , 1984
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