1. Water recycling and reuse in EUREAU countries: Trends and challenges
2. Wastewater reuse in Europe
3. Public Utilities Board Singapore,NEWater, http://www.pub.gov.sg/water/newater/Pages/default.aspx (2011, accessed 21/07/2011).
4. Dillon , P. Water reuse in Australia: Current status, projections and research . Proceedings of Water Recycling Australia 2000 . Oct 19–20 2000 , Adelaide . Edited by: Dillon , P. J. pp. 99 – 104 .