B. N. Lohani y Rajagopal, K.,
Human and animal waste management strategies in developing countries, vol. no. 4/5. Bangkok, Thailand: Environmental Sanitation Information Center, ENSIC, 1981, p. v, 89 p. : 31 fig., 38 tab.
S. K. Runyoro,
«Pit latrine emptying». Loughborough University of Technology, Department of Civil Engineering, Loughborough, UK, p. viii, 94 p.: fig., tab., 1981.