UK Department for International Development and the Natural Environment Research Council, 2015
Majalah, Jurnal, Buletin
Ridker, Ronald G.
Washinton The World Bank 1994,
Buku Teks
Heneveld, Word
The World Bank , 1996
Buku Teks
Artikel Jurnal
edited Lewis E. Weeks, Howard J. Berman, Gerald E. Bisbee
Health Administration Press, 1979
Buku Teks