B. Brandberg,
“The latrine project, Mozambique”, vol. 58erev. International Development Research Centre (IDRC), Ottawa, Ont, Canada, p. 98 p.: fig., 1985.
P. R. Morgan and Mara, D. D.,
“Ventilated improved pit latrines : Zimbabwean brick design”, vol. no. 1. World Bank, Washington, DC, USA, p. iv, 47 p.: fig., tab., 1985.