J. R. Howard, Olen, B., Eales, K., Douglas, S., Quinn, N., y Voller, R.,
«The development of a site sanitation planning and reporting aid (SSPRA) for the selection of appropriate sanitation technologies for developing communities», vol. 586/1/00. Water Research Commission, WRC, Pretoria, South Africa, 2000.
P. B. Moriarty,
«Integrated catchment management and sustainable water resource development in semi-arid Zimbabwe», vol. no. 35 E. IRC, Delft, The Netherlands, p. xvi, 154 p. + 36 p. annexes : 69 fig., 8 plates, 23 tab., 2000.
P. B. Moriarty,
«Towards development of a decision support system for water resource development in semi-arid micro-catchments», vol. no. 21. Institute of Environmental Studies, University of Zimbabwe, Harare, Zimbabwe, p. 35 p. : 13 fig., 6 tab., 2000.