J. T. Inglis,
Traditional ecological knowledge : concepts and cases. Ottawa, Ont, Canada: International Development Research Centre (IDRC), 1993, p. 142 p.: fig., map., tab.
P. Roark, Gearheart, R. A., Jennings, L., Finney, B. A., y McKee, M.,
«Workshop on wastewater treatment for small communities in the Middle East», vol. no. 435. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. viii, 48 p.: 10 photogr. + brochure (8 p.), 1993.