C. Platzer, Hoffmann, H., y Ticona, E.,
«Alternatives to waterborne sanitation : a comparative study : limits and potentials
», presented at the 2008-11-19, Delft, The Netherlands, 2008, p. 11 p.; 13 ref.; 7 tab.; 12 fig.
M. Adank,
«Ghana test», Accra, Ghana: UNICEF Regional Office for West and Central Africa, 2008.