text: * [http://aeesociety.org/ American Ecological Engineering Society], homepage.
  * [http://groups.engr.oregonstate.edu/eess/ Ecological Engineering Student Society] Website, EESS, Oregon State University, 2011.
  * [https://web.archive.org/web/20170919162604/http://aspwe.org/ American Society of Professional Wetland Engineers], homepage, wiki.
  * [http://www.ecological-engineering.com/ Ecological Engineering Group], homepage.
  * [http://www.iees.ch/ International Ecological Engineering Society] homepage.