U. Winblad, Drangert, J. - O., y Bew, J.,
«Ecological alternatives in sanitation : proceedings from Sida Sanitation Workshop, Balingsholm, Sweden 6-9 August 1997», vol. no. 9. SIDA, Swedish International Development Cooperation Agency, Stockholm, Sweden, p. ii, 90 p. : ill., tab., 1997.