1. Carson R (2000) Silent Spring. Penguin Classics, London.
2. Commoner B (1972) The Closing Circle: Confronting the Environmental Crisis, Jonathan Cape, London.
3. Dubos R, Ward B (1972) Only One Earth: The Care and Maintenance of a Small Planet. Penguin, Harmondsworth.
4. Meadows DH et al. (1974) The Limits to Growth, Pan Books, London.
5. Schmidheiny S (1992) Changing Course: A Global Business Perspective on Development and the Environment, MIT Press.