1. Water resources and environmental issues;Pimentel;Bioscience,2004
2. Integrated water management for the 21st century. Problems and solutions;Bouwer;J. Irrig. Drainage Eng.,2002
3. Air and Water Pollution: Burden and Strategies for Control. Chapter 43. In Book: Disease Control Priorities in Developing Countries;Kyellstrom,2006
4. G. Hutton, L. Haller, Evaluation of the costs and benefits of water and sanitation improvements at the global level./WHO/SDE/WSH/04.04.2004. Geneva: World health organization who.int/water sanitation.
5. World Health Organization (WHO) Diarrheal disease. Fact sheet №330, April 2013.www.who.int/.