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2. Birnbacher, Dieter: Verantwortung für zukünftige Generationen. Stuttgart 1988.
3. Callicott, J. Baird: „The Conceptual Foundations of the Land Ethic.“ In: Ders. (Hg.): Companion to a Sand County Almanac. Interpretive and Critical Essays. Madison 1987, 186–220.
4. Callicott, J. Baird/Frodeman, Robert (Hg.): Encyclopedia of Environmental Ethics and Philosophy. Farmington Hills 2008.
5. Clark, Stephen R.L.: The Moral Status of Animals. Oxford 1977.