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.

P. Walker y Pollard, S., «Catchment management and water supply and sanitation in the Sand River Catchment, South Africa : description and issues», vol. no. 1. Natural Resources Institute, University of Greenwich, Chatham, UK, p. 18 p. : 11 boxes, 1 fig, 2 tab., 2000.