1. UN Environment Programme, Green Infrastructure Guide for Water Management (UNEP, Nairobi, 2014).
2. Sink or Swim? Water security for growth and development
3. Department of Economic and Social Affairs, Population Division, United Nations, World Population Prospects: The 2012 Revision, Volume I: Comprehensive Tables (ST/ESA/SER.A/336, UN, New York, 2012).
4. Organization for Economic Cooperation and Development, Environmental Outlook to 2050 (OECD Publishing, Paris, 2012).
5. Office of Water, U.S. Environmental Protection Agency, “Drinking water infrastructure needs survey and assessment: Fifth report to Congress” (4606M EPA 816-R-13-006, EPA, Washington, DC, 2013).