Case study in Syria
http://www2.gtz.de/ecosan/download/ecosan-pds-015-Syria-HaranAlAwamied.pdf
Case studies Greywater treatment in Germany
http://www.otterwasser.de/english/concepts/lande.htm
http://www2.gtz.de/ecosan/download/ecosan-pds-004-Germany-Luebeck-Flintenbreite.pdf
General information about Constructed wetlands
http://www.bodenfilter.de/engdef.htm
US EPA Manual
http://www.epa.gov/ordntrnt/ORD/NRMRL/Pubs/2001/wetlands/625r99010.pdf
EU Guide “Extensive Wastewater Treatment Processes�
EU project SWAMP focussing on natural wastewater treatment
http://www.swamp-eu.org/