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*Hebert, P. (2010). [https://www.crs.org/sites/default/files/tools-research/rapid-assessment-of-crs-experience-with-arborloos-in-east-africa.pdf Rapid Assessment of CRS Experience with Arborloos in East Africa]. Catholic Relief Service (CRS), Baltimore, US.:Available at: [http://www.susana.org/library susana.org/library]

* Morgan, P. R. (2004). [https://www.susana.org/en/knowledge-hub/resources-and-publications/library/details/986 An Ecological Approach to Sanitation in Africa. A Compilation of Experiences]. Aquamor, Harare, ZW. Chapter 10: The Usefulness of Urine.:Available at: www.ecosanres.org

* Morgan, P. R. (2007). [https://www.susana.org/en/knowledge-hub/resources-and-publications/library/details/195 Toilets That Make Compost. Low-Cost, Sanitary Toilets That Produce Valuable Compost for Crops in an African Context]. Stockholm Environment Institute, Stockholm, SE. pp. 81-90.:Available at: www.ecosanres.org

* Morgan, P. R. (2009). [https://www.susana.org/en/knowledge-hub/resources-and-publications/library/details/989 Ecological Toilets. Start Simple and Upgrade from Arborloo to VIP]. Stockholm Environment Institute, Stockholm, SE.:Available at: [http://www.ecosanres.org ecosanres.org]

* NWP (2006). [https://www.ircwash.org/resources/smart-sanitation-solutions-examples-innovative-low-cost-technologies-toilets-collection Smart Sanitation Solutions. Examples of Innovative, Low-Cost Technologies for Toilets, Collection, Transportation, Treatment and Use of Sanitation Products]. Netherlands Water Partnership, The Hague, NL. p. 51.:Available at: [http://www.ircwash.org ircwash.org]