World Bank. Regional Water and Sanitation Group for West and Central Africa -Abidjan, CI, Groupe Regional Eau et Assainissement Afrique de l'Ouest / GREA-AO,
«Republic of Ghana : rural water supply and sanitation sector strategy». World Bank Regional Water and Sanitation Group Western Africa, Abidjan, Ivory Coast, p. iv, 60 p.: fig., tab., map, 1991.