| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| In Nature's Interests?: Interests, Animal Rights, and Environmental Ethics | 978-0-19-515201-2 (0-19-515201-8) | 2002 |
| Personhood, Ethics, and Animal Cognition: Situating Animals in Hare's Two Level Utilitarianism | 978-0-19-975878-4 (0-19-975878-6) | 2012 |