Wynia, Gary W., author
Cambridge University Press , 1984
Buku Teks
edited by Howard J. Wiarda, Harvey F. Kline
Westview Press, 2007
Buku Teks
Wiarda, Howard J., author
Wardword, 1995
Buku Teks
Westview Press , 1984
Buku Teks
Rogers, William D., author
Random House, 1967
Buku Teks