Hogbin, Herbert Ian, author
Holt, Rinehart and winston, 1964
Buku Teks
United Nations,, 1995
Buku Teks
Mooney, Gavin H., author
MacMillan Press , 1980
Buku Teks
Ramazanoglu, Caroline, 1939-, author
Sage, 2003
Buku Teks
Sekhar, R.C.
Response Book, 2002
Buku Teks