1. Is there a need for a new, an environmental, ethic?;Sylvan,1993
2. The shallow and the deep, long‐range ecology movement. A summary∗
3. The Imperative of Responsibility: In Search of an Ethics for the Technological Age;Jonas,1984
4. Animal Liberation: Towards an End to Man’s Inhumanity to Animals;Singer,1986
5. The Case for Animal Rights;Regan,2004