Berkoh, C., Hirsch, D., Larbi, E., Leenen, F., Ntow, S., Smet, J.E.M., y Tuinsma, M., «The feasibility of public private partnership for sustainable water supply to the urban poor in Ghana». Netherlands Water Partnership (NWP), Delft, The Netherlands, p. iii, 95 p. : tab., 2004.

Berkoh, C., «Slow sand filtration water treatment», in Water, sanitation, environment and development : proceedings of the 19th WEDC conference, Accra, Ghana, 6-10 September 1993, 1993, pp. P. 93-95 : 5 tab.