* Morgan, P. R. (2007). [http://www.ecosanres.org/pdf_files/ToiletsThatMakeCompost.pdf Toilets That Make Compost. Low-Cost, Sanitary Toilets That Produce Valuable Compost for Crops in an African Context]. Stockholm Environment Institute, Stockholm, SE.:Available at: [http://www.ecosanres.org ecosanres.org]
* Morgan, P. R. (2009). [http://www.ecosanres.org/pdf_files/EcologicalToilets-PeterMorgan-Mar2009.pdf Ecological Toilets. Start Simple and Upgrade from Arborloo to VIP]. Stockholm Environment Institute, Stockholm, SE.:Available at: [http://www.ecosanres.org ecosanres.org]