| title | media type | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|---|
| Billy the Ghost and Me | Hardcover | 978-0-06-026782-7 | 1997 | Gery Greer · Bob Ruddick |
| Billy the Ghost and Me | Library Binding | 978-0-06-026783-4 | 1997 | Gery Greer · Bob Ruddick |
| Billy the Ghost and Me | Paperback | 978-0-06-444214-5 | 1997 | Gery Greer · Bob Ruddick |
| Fishing for Methuselah | Hardcover | 978-0-06-027592-1 | 1998 | |