| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Fourth Workshop on Grand Unification, University of Pennsylvania, Pa, April 21-23, 1983 | 978-O-8176-3169-7 (O-8176-3169-O) | 1984 | Workshop on Grand Unification · P. Langacker · Paul J. Steinhardt |