IWA -London, GB, International Water Association,
“Solutions through innovation”. International Water Association (IWA), London, UK, p. 8 p. : 2 fig., photogr.
K. E. South Nyan Homa-Bay,
“Sonbo newsletter”. South Nyanza Bongu Organization, Homa-Bay, Kenya.
SOPAC miscellaneous report. Suva, Fiji: SOPAC (South Pacific Applied Geoscience Commission).
F. J. S. O. P. A. C. - Suva,
“SOPAC news”. SOPAC (South Pacific Applied Geoscience Commission), Suva, Fiji.
F. J. S. O. P. A. C. - Suva,
“SOPAC water and sanitation”. SOPAC (South Pacific Applied Geoscience Commission), Suva, Fiji.
“Soundings from around the world”. World Neighbors, Oklahoma City, OK, USA.
UNDP -New York, NY, US,
“Source”. UNDP Division of Information, New York, NY, USA.
USAID -Washington, DC, US en Horsley and Witten -Sandwich, MA, US,
“Source water protection: a training manual for communities in Nicaragua”. US Environmental Protection Agency (EPA), Washington, DC, USA, p. 57 p. : fig., fotographs.
T. F. Bastemeijer,
“Southern Darfur province of Sudan”. IRC, The Hague, The Netherlands, p. Slide series (64 slides + text, 3p.).