F. P. Du Toit,
“A design for rural village waterpoints in Zimbabwe”, in
Proceedings of the seminar on water supply and drainage services in developing countries = Verrigtinge van die seminaar oor watervoorsienings- en dreineringsdienste in ontwikkelende lande, 1980, p. Paper 7 (8 p.).
L. H. Robertson,
“The development of self-help piped water projects in Malawi : management and planning”, in
Proceedings of the seminar on water supply and drainage services in developing countries = Verrigtinge van die seminaar oor watervoorsienings- en dreineringsdienste in ontwikkelende lande, 1980, p. Paper 1 (2 p.).
J. L. Ventura Rivas, J. Velasco, O., Roque, J. R., D. de la O., C., and Oviedo, F. A.,
“Manual de promocion de comunidades para sistemas de agua potable y letrinizacion en el medio rural”. El Salvador, Departamento de Acueductos Rurales, San Salvador, El Salvador, p. ca. 200 p., 1980.