1. Materials and the Environment – Eco-informed Material Choice;Ashby,2012
2. Viewpoint: Weak versus Strong Sustainability;Ayres,1998
3. Report of the World Commission on the Environment and Development;Brundlandt,1987
4. Natures role in sustaining economic development;Dasgupta;Phil. Trans. Roy. Soc. B,2010
5. Dow Jones Sustainability Index, 2012. http://www.sustainability-index.com/. (One of several indices of sustainability, reviewed in Chapter 4.)