1. The world commission on environment and development: our common future,1987
2. Environmental engineering: fundamentals, sustainability, design;Mihelcic,2010
3. The Millennium Development Goals report,2015
4. Sanitation: a global estimate of sewerage connections without treatment and the resulting impact on MDG progress;Baum;Environ Sci Technol,2013
5. United Nations. Transforming our world: the 2030 agenda for sustainable development [Internet]. [cited 2016 Mar 21]. Available from: https://sustainabledevelopment.un.org/content/documents/21252030%20Agenda%20for%20Sustainable%20Development%20web.pdf.