P. Calvert,
“Compost toilets : practical action, technology challenging poverty”. The Schumacher Centre for Technology and Development, Rugby, UK, p. 5 p. : 1 fig.
S. Africa. De ZA,
“Sanitation technology options”. South Africa, Department of Water Affairs and Forestry, Pretoria, South Africa, p. 30 p.; ill.; techn. drwng; tab.; fig.
K. Nimpuno,
“Sewage disposal in developing countries : a survey of methods”. Bouwcentrum International Education (BIE), Rotterdam, The Netherlands, p. 49 p. : fig., tab.