Davidson, Jamie S., author
Cambridge University Press, 2018
Buku Teks
Raghavan, G. N. S.
Gian Publishing House, 1990
Buku Teks
Carnegie Council on Ethics and International Affairs , 1992
Buku Teks
Rosenberg, Arthur, author
A.A. Knopf, 1939
Buku Teks
Oxford University Press, 1995
Buku Teks