K. Nimpuno,
“Sewage disposal in developing countries : a survey of methods”. Bouwcentrum International Education (BIE), Rotterdam, The Netherlands, p. 49 p. : fig., tab.
G. B. National I. Silsoe,
“Simple water pump”. National Institute of Agricultural Engineering, Silsoe, UK, p. 8 p. : techn.drwng.
J. C. Royer,
“Standard detail drawings - waterworks : a job - aid”. Pan American Health Organization (PAHO), Bridgetown, Barbados, p. 29 p.: techn.drwngs.