1. United Nations. 2011 millennium development goals report. New York, NY: United Nations, 2011.
2. The Joint Monitoring Programme, UNICEFF/WHO. 2014.10.10, WHO/UNICEF JMP, 2014. http://www.wssinfo.org/documents/?tx_displaycontroller[type]=country_files (5 November 2014, date last accessed).
3. Recurrent cost of water services in a developing country: the case of two large urban water systems in Ghana;Bismark;Ghanaian J Econ,2015
4. Lynch M , Matthews P . Channels for change: private water and the urban poor, IIED Briefing Paper May 2010. International Institute for Environment and Development (IIED), 2010. http://pubs.iied.org/pdfs/17060IIED.pdf (30 May 2015, date last accessed).