| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Introductory Astronomy and Astrophysics | 978-0-03-006228-5 (0-03-006228-4) | 1997 | Michael Zeilik |
| Introductory Astronomy and Astrophysics | 978-0-03-031697-5 (0-03-031697-9) | 1992 | Michael Zeilik · Elske V. Smith |
A.G. · A. Gregory · s. a. · S. G. · S Gregory · Stephen A. · Stephen G. · Stephen Gregory