Raghavan, G. N. S.
Gian Publishing House, 1990
Buku Teks
Carnegie Council on Ethics and International Affairs , 1992
Buku Teks
Rosenberg, Arthur
A.A. Knopf, 1939
Buku Teks
Oxford University Press, 1995
Buku Teks
Schulz, Ernest B
[publisher not identified], 1956
Buku Teks