Abraham, E.T., van Rooijen, D., Cofie, O. and Raschid-Sally, L. (2007) Planning Urban Water-Dependent Livelihood Opportunities for the Poor in Accra, Ghana. SWITCH Scientific Meeting, International Water Management Institute, Accra.
 Labite H., van der Steen, P. and Lens P. (2008) Analysis of Health Benefits versus Costs of Interventions in the Urban Water System in Accra, Using Quantitative Microbial Risks Assessment. WaterMill Working Paper Series, Vol. 14, 8.
 Pearce, D.W., Adger, W.N., Brown, K., Cervigni, R. and Moran, D. (1993) Mexico Forestry and Conservation Sector Review: Sub study of Economic Valuation of Forests. Report by SCERGE, University of East Anglia and University College London, for the World Bank, Latin America and the Caribbean Country Department LA2, Washington DC.
 World Bank Water Demand Research Team (1993) The Demand for Water in Rural Areas: Determinants and Policy Implications. The World Bank Research Observer, 8, 47-70.
 Bah, I. (1997) Estimating Household’s Valuation for Potable Water Supply Service in Urban Areas: The Case of Freetown, Sierra Leone. Unpublished Master’s Dissertation, University of Botswana, Gaborone.
 Olajuyigbe, A.E. and Fasakin, J.O. (2010) Citizens’ WTP for Potable Sustainable Water Supply in a Medium-Sized City in South Western Nigeria. Current Research Journal of Social Sciences, 2, 41-50.
 Asenso-Okyere, W.K., Osei-Akoto, I. and Appiah, E.N. (1997) WTP for Health Insurance in a Developing Economy. A Pilot Study of the Informal Sector of Ghana Using Contingent Valuation. Health Policy, 42, 223-237. http://dx.doi.org/10.1016/S0168-8510(97)00069-9
 Afroz, R., Hassan, M.N., Awang, M. and Ibrahim, N.A. (2005) WTP for Air Quality Improvement in Klang Valley, Malaysia. American Journal of Environmental Sciences, 1, 194-201.
 Rodriguez, E., Lacaze, V. and Lupin, B. (2007) WTP for Organic Food in Argentina: Evidence from a Consumer Survey. School of Economic and Social Sciences, Universidad Nacional de Mar del Plata, Mar del Plata.
 Asafo-Adjaye, J. and Dzator, J. (2003) WTP for Malaria Insurance: A Case Study of Households in Ghana Using the Contingent Valuation Method. Economic Analysis and Policy, 33, 31-47.
 Cranfield, J.A.L. and Magnusson, E. (2003) Canadian Consumer’s Willingness-to-Pay for Pesticide Free Food Products: An Ordered Probit Analysis. International Food and Agribusiness Management Review, 6, 13-30.
 Whittington, D., Briscoe, J., Mu, X. and Barron, W. (1990) Estimating the WTP for Water Services in Developing Countries: A Case Study of the Use of Contingent Valuation Surveys in Southern Haiti. Economic Development and Cultural Change, 38, 293-311. http://dx.doi.org/10.1086/451794