Biblio

P. Calvert, Seneviratne, A., Premakumara, D. G. J., and Mendis, U. A., “Ecological sanitation a success in Sri Lanka”, Waterlines, an international journal of water, sanitation and waste, pp. p. 22-24 : 4 boxes, 1 fig., 4 photogr., 2002.

P. Calvert, “Seeing (but not smelling) is believing : Kerala's compost toilet”, Waterlines, an international journal of water, sanitation and waste, pp. p. 30-32 : 2 drwngs., 2 photogr., 2 tab., 1997.