edited by Arnold Pacey for Oxfam and the Ross Institute of Tropical Hygiene
John Wiley & Sons, 1978
Buku Teks
Page, Sheila, author
Overseas Development Institute, 2000
Buku Teks
edited by Stephan Haggard, Chung H. Lee and Sylvia Maxfield
Cornell University Press, 1993
Buku Teks
World Bank, 1980
Buku Teks
edited by Richard M. Bird and Oliver Oldman
John Hopkins, 1967
Buku Teks