| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Superstrings and Grand Unification | 978-9971-5-0528-8 (9971-5-0528-2) | 1989 |
| Superstrings and Grand Unification: Proceedings of the Winter School on High Energy Physics, Puri, India 3-17 January 1988 | 978-9971-5-0527-1 (9971-5-0527-4) | 1989 |