| title | ISBN-13 (ISBN-10) | 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 (0-9723936-2-5) | 2003 | Galadriel Waters · Astre Mithrandir |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter | 978-0-9723936-4-5 (0-9723936-4-1) | 2005 | Astre Mithrandir · Galadriel Waters |
| Ultimate Unofficial Guide to the Mysteries of Harry Potter: Analysis of Book 6 | 978-0-9723936-6-9 (0-9723936-6-8) | 2007 | Galadriel Waters · Astre Mithrandir |