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Nyarko, K.B., Dwumfour-Asare, B., Appiah-Effah, E., Moriarty, P.B., y Obuobisa-Darko, A., «Life-cycle costs in Ghana: post-construction costs of water point-systems», WASHCost Ghana briefing note series, vol. 2. IRC, The Hague, p. 12 p.; 3 fig.; 3 tab.; 2 photographs, 2011.

Nyarko, K.B., Dwumfour-Asare, B., Appiah-Effah, E., y Moriarty, P.B., «Costs of delivering water service in rural areas and small towns in Ghana : paper presented at the IRC symposium ‘ Pumps, Pipes and Promises: Costs, Finances and Accountability for Sustainable WASH Services' in The Hague, The Netherlands from 16 - 18 Nove», presented at the 2010-11-16, The Hague, The Netherlands, 2010, p. 20 p. : 10 fig., 8 tab.