===References===
* NWRI (2012). [https://7d22a3c6-d58b-4636-8cac-3260dc7d6552.filesusr.com/ugd/632dc3_c8ab78b05021452c8a520c3b6dba48ca.pdf?index=true Ultraviolet Disinfection. Guidelines for Drinking Water and Water Reuse]. 3rd Ed. National Water Research Institute and Water Research Foundation, Fountain Valley, CA, US.:Available at: [http://www.nwri-usa.org nwri-usa.org]
* Robbins, D. M. and Ligon, G.C. (2014). [https://forum.susana.org/comparisons-of-various-wastewater-treatment-types/10768-how-to-design-wastewater-systems-for-local-conditions-in-developing-countries How to Design Wastewater Systems for Local Conditions in Developing Countries]. IWA Publishing, London, UK.
* SSWM Toolbox. (last accessed February 2014):[http://www.sswm.info/category/implementation-tools/water-purification SSWM Water Purifiction Purification Tools]SSWM Toolbox. (last accessed February 2021)
* Tchobanoglous, G., Burton, F. L. and Stensel, H. D. (2004). Wastewater Engineering: Treatment and Reuse, Metcalf & Eddy, 4th Ed. (Internat. Ed.). McGraw-Hill, New York, US. pp. 1035-1330.(Book)
* WHO (2006). [https://www.who.int/water_sanitation_health/publications/gsuweg2/en/ Guidelines for the Safe Use of Wastewater, Excreta and Greywater. Volume 2: Wastewater Use in Agriculture]. World Health Organization, Geneva, CH.:Available at: [http://www.who.int who.int]
* [http://www.who.int/water_sanitation_health/publications/guidelines-on-sanitation-and-health/en/ WHO: Guidelines on sanitation and health - 2018]