Mani, Sunil, editor
New York : United Nations University Press, 2004,
Buku Teks
edited by Sunil Mani, Henny Romijn
United Nations University Press, 2004
Buku Teks
Englert, Robert D., author
McGraw-Hill, 1990
Buku Teks
Unesco Press, 1975
Buku Teks
Page, Sheila, author
Overseas Development Institute, 2000
Buku Teks