Joshua, Wynfred
Sage, 1973
Buku Teks
Kitzinger, Uwe W.
Frederick A. Praeger, 1963
Buku Teks
Granick, David
MIT Press, 1972
Buku Teks
Meny, Yves
Oxford University Press, 1998
Buku Teks
Schilling, Warner Roller, 1925-
Columbia University Press, 1962
Buku Teks