Huntington, Samuel P., author
The Belknap Press, 1981
Buku Teks
edited by Stephen K. Bailey
United States Information Agency, 1973
Buku Teks
Singh, Robert
Polity Press, 2002
Buku Teks
[publisher not identified], 1968
Buku Teks
Simpson, David, author
Oxford University Press , 1986
Buku Teks