Neumann, Victor
The Council for Research in Values and Philosophy , 2000
Buku Teks
Meridiane Publishing House, 1986
Buku Teks
Military Publishing House, 1976
Buku Teks
Distributed by Europolis Pub, 1946
Buku Teks
edited by Robert Gilpin and Christopher Wright
Columbia University Press , 1965
Buku Teks