Biblio

J. Pickford, Stoveland, S., y Quansah, E. V., «Ghana low cost human wastes management : Kumasi pilot project : training network centre, Kumasi : report of the evaluation mission». UNDP (United Nations Development Programme), New York, NY, USA, p. VI, 32 p. + annexes (ca. 25 p.) : fig., 1992.

C. A. A. Butijn, Hoadley, A. W., Umolu, J., y Stoveland, S., «Nigeria : Rusafiya (rural water supply and sanitation) : report of evaluation mission». UNDP (United Nations Development Programme), New York, NY, USA, p. 80 p. + annexes (ca. 80 p.): fig., tab., 1991.