Biblio

R. C. G. Varley, Tarvid, J., y Chao, D. N. W., «A reassessment of the cost-effectiveness of water and sanitation interventions in programmes for controlling childhood diarrhoea», Bulletin of the World Health Organization, pp. p. 617-637 : 1 fig., 4 tab., 1998.

R. C. G. Varley, «Child survival and environmental health interventions : a cost-effectiveness analysis», vol. no. 4. Environmental Health Project (EHP), Arlington, VA, USA, p. ii, 26 p. : 1 fig., 5 tab., 1996.