HarperCollins · Oxford University Press
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Coming of age in philosophy | 978-0-06-382594-9 (0-06-382594-5) | 1973 |
| The ways of religion | 978-0-06-382595-6 (0-06-382595-3) | 1975 |
| The Ways of Religion: An Introduction to the Major Traditions | 978-0-19-511835-3 (0-19-511835-9) | 1999 |