1. Anglo American, 2011. Emalahleni Water Reclamation Plant. http://www.angloamerican.co.za/sustainable-development/case-studies/emalahleni-water-reclamation-plant.aspx Accessed 30 May 2011
2. Brundtland, GH (Ed.), 1987. Our Common Future. Report of the World Commission on Environment and Development of 20 March 1987. http://www.un-documents.net/wced-ocf.htm Accessed 18 July 2011.
3. Critical New Bio-Socio-Technological Challenges in Urban Sustainability