| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| New Clues to Harry Potter Book 5: Hints from the Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-2-1 | 2003 | Galadriel Waters · E.L. Fossa |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-4-5 | 2005 | E. L. Fossa · Galadriel Waters |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-1-4 | 2003 | Galadriel Waters |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-0-7 | 2002 | |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter: Analysis of Book 6 | 978-0-9723936-6-9 | 2007 | Galadriel Waters · E. L. Fossa |