1. Composition of human excreta – a case study from Southern Thailand;Schouw;Sci Total Environ,2002
2. Sobsey MD. Excreta and household wastewaters – introduction. Global Water. Sanitation and Hygiene; 2006; ENVR 890 section 003, ENVR 296 section 003.
3. Esrey SA. Towards a recycling society. Ecological sanitation – closing the loop to food security. In: Proceedings of the international symposium, 30–31 October, 2000. Bonn, Germany. GTZ, GmbH; 2001.
4. Ecological Sanitation – a way to solve global sanitation problems?;Langergraber;Environ Int,2005
5. WHO/UNICEF/WSSCC. Global Water Supply and Sanitation Assessment Report. WHO/UNICEF/WSSCC; 2000.