1. Agenda 21. (1992). United Nations Conference on Environment & Development Rio de Janerio, Brazil, 3 to 14 June 1992. Conference documents:
http://www.unep.org/Documents.Multilingual/Default.asp?DocumentID=52
. Fulltext of Agenda 21:
http://sustainabledevelopment.un.org/content/documents/Agenda21.pdf
. Accessed 27 Sept 2013.
2. Ajzen, I., & Fishbein, M. (1980). Understanding attitudes and predicting social behaviour. Eaglewood Cliffs: Prentice Hall.
3. Bonnett, M. (2007). Environmental education and the issue of nature. Journal of Curriculum Studies, 39(6), 707–721.
4. Bowers, C. (2013). Personal webpage.
http://www.cabowers.net
. Accessed 20 Aug 2013.
5. Butters, C. (2012). Nordic success stories in sustainability. Oslo: Stiftelsen Idébanken.
http://thebalancingact.info/riobok/NORDICSuccessstoriesinSustainability.pdf
. Accessed 27 Sept 2013.