NEDECO -The Hague, NL

Amersfoort, N.L.D.H.V.- et al., 1974. Shinyanga water supply survey : water master-plan study for Shinyanga region : final report. [Vol. II :] Technical annex D : sociology, Amersfoort, The Netherlands: DHV. Available at: https://fr.ircwash.org/sites/default/files/824TZSH74-4443.pdf.