K. B. Nyarko, Awuah, E., and Ofori, D.,
“Self supply schemes for community water supply in Ghana”, in
Access to sanitation and safe water: global partnerships and local actions : 33rd WEDC conference, Accra, Ghana, 13-17 November 2006 : conference proceedings, 2008, pp. P. 441-425 : 3 photogr.
D. N. Barton, Raju, K. V., and McNeill, D.,
“Water valuation and pricing – when are they useful in water management?”, vol. no. 3. Norwegian Institute for Water Research, NIVA, Oslo, Norway, p. 7 p. : ill., 2008.