Singh, Lalita Prasad, author
University of Missouri Press, 1966
Buku Teks
Institute for Public Policy Studies , 1992
Buku Teks
Adler, Karlsson G.
Springer-Verlag, 1976
Buku Teks
Ball, Joseph H
World Peace Foundation, 1943
Buku Teks
The SESRIC, 2009
Majalah, Jurnal, Buletin