1. Sustainability Indicators: Measuring the Immeasurable?;Bell,1999
2. Black, A., 2004. The quest for sustainable, healthy communities, presented to Effective Sustainability Education Conference, NSW Council on Environmental Education, UNSW, Sydney, 18–20 February, 2004.
3. CEM, 2006. Defining and Identifying Environmental Limits for Sustainable Development: Final Technical Report. A Scoping Study. Full technical report, Centre for Environmental Management, School of Geography, University of Nottingham, March 2006, Project Code NR0102.
4. Colantonio, A., 2007. Social Sustainability: An Exploratory Analysis of its Definition, Assessment Methods, Metrics and Tools. Measuring Social Sustainability: Best Practice from Urban Renewal in the EU, 2007/01: EIBURS Working Paper Series. Oxford Brookers University, Oxford.
5. Dahl, A., 1999. Living within environmental limits: Implications of BaháI principles for sustainable development. http://www.bcca.org/ief/ddahl99a.htm. Accessed December 2010.