1. Arias C. A., Brix H. and Garza M. F. (2005). Alternatives for phosphorus removal in subsurface flow constructed wetlands. Book of the Conference of International Meeting on phytodepuration, pp.73-79. Lorca, Spain.
2. Boom S., Huibers F. P. and VanLier J. B. (2008). Wastewater irrigation in Jordan: A mismatch in macro nutrient provision. Water Practice and Technol., 3(2), 1021-1022.
3. Reed bed treatment systems for sewage treatment in the United Kingdom-the first 10 years' experience
4. DeVillez P. and Foster W. D. (2009). 2009-Purdue corn and soybean performance trails. Department of Agronomy, Agricultural Research Programs, Purdue University. Indiana Agrinews Report. (http://www.agrinews-pubs.com/onlinefiles/filelinks/ 2009purduetest.pdf ) (March 10, 2010).
5. Ebeling J., Tsukuda S., Hankins J. and Solomon C. (2003). Performance evaluation of a recirculating sand filter and peat filter in West Virginia. Small Flow Quarterly, 4(1), 27-37.