| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Challenges to Morality | 978-0-02-350591-1 | 1993 | |
| Ethics | 978-0-06-046345-8 | 1968 | Philippa Foot · P. T. Geach · Alan Gewirth · John Rawls · G. E. M. Anschombe · J. J. Smart · Arnold Isenberg, et. al. Colin Strang |
| Our Knowledge of Right and Wrong | 978-0-04-170025-1 | 1971 | |
| Our knowledge of right and wrong | 978-0-391-00096-4 | 1971 | |