- _On Becoming Human_ (2006)
- _Animal Liberation: The Philosophy and its Meaning_ (2004)
- _Ethics: The Fundamentals_ (2020)
Essays and Articles
- "Animals and the Value of Life" (1975)
- "In Defense of Vegetarianism" (1979)
- "The Case for Animal Rights" (1983)
- "Animal Experimentation: The Arguments For and Against" (1985)
- "Environmental Ethics: The Challenge of the Future" (1986)
Published Debates
- _Animals, Science, and Ethics_ (with Bernard Rollin) (1989)
- _Animal Rights and Human Interests_ (with Cass Sunstein and Martha Nussbaum) (2004)