1. Agar N (2001) Life’s intrinsic value. Columbia University Press, New York
2. Attfield R (1987) The theory of value and obligation. Routledge, London
3. Attfield R (2003) Biocentric consequentialism, pluralism and the minimax implication: a reply to Alan Carter. Utilitas 15(1):76–91
4. Bookchin M (1995) The ecology of freedom. AK Press, Oakland
5. Brennan A (1992) Moral pluralism and the environment. Environ Values 1(1):15–32