Biblio

S. Smits, Pollard, S., D. Toit, du, Butterworth, J., y Moriarty, P. B., «Modelling scenarios for water resources management in the Sand River Catchment, South Africa», vol. no. 8. IRC and Natural Resources Institute, University of Greenwich, Chatham, UK, p. 20 p. : 5 fig., 8 tab., 2004.

C. Batchelor, Reddy, Y. V. Malla, y Butterworth, J., «Addressing WATSAN needs in watershed development projects», Waterlines, an international journal of water, sanitation and waste, pp. p. 17-18 : 1 photogr., 2002.