The Work Bank , 1981
Buku Teks
Ridker, Ronald G.
Washinton The World Bank 1994,
Buku Teks
UK Department for International Development and the Natural Environment Research Council, 2015
Majalah, Jurnal, Buletin
editor Peter de Haan and Yvonne van Hees
Netherlands Development Cooperation Information Department, 1996
Buku Teks
edited by John A. Wiseman
Routledge, 1995
Buku Teks