George, T.J.S
Oxford University Press, 1980
Buku Teks
Ateneo de Manila University, 2002
Buku Teks
Esposito, John L., author
Syracuse University Presss, 1984
Buku Teks
Timberman, David G.
M.E. Sharpe, 1991
Buku Teks
Vatikiotis, Michael R.J., author
Routledge, 1998
Buku Teks