Biblio

P. Calvert, Seneviratne, A., Premakumara, D. G. J., y 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 y Nghien, P. S., «Appraisal of the Vinsanres eco-san toilet demonstration project 1997-2000». Viet Nam, Ministry of Health, Hanoi, Viet Nam, p. 58 p. : tabs., 2000.

P. Calvert, «Compost toilets : practical action, technology challenging poverty». The Schumacher Centre for Technology and Development, Rugby, UK, p. 5 p. : 1 fig.