World Health Organization, 1994
Buku Teks
edited by Larry W. Mays
McGraw-Hill, 2002
Buku Teks
United Nations Centre for Human Settlements (Habitat), 1991
Buku Referensi
Kalbermatten, John M.
The World Bank, 1980
Buku Teks
Wijk-Sijbesma, Christine van
The Hague, 1985
Buku Teks