1. World Commission on Environment and Development 1987 Report of the World Commission on Environment and Development: Our Common Future. http://www.un-documents.net/wced-ocf.htm
2. UNESCO (United Nations Educational, Scientific and Cultural Organisation) 2002 Teaching and Learning for a Sustainable Future
3. Lacerda , L. 2007 18th Annual General Assembly (AGA) and Conference http://www.efc.be/ftp/public/AGA_ Presentations/2007/Sustainabilityplus_Lacerda.pdf
4. The population paradox
5. The ecological perspective in chemical engineering