R. H. · R. Howells · Robert G. Howells · Robert H.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Inside the Prioryof Sion | 978-1-78028-017-2 (1-78028-017-3) | 2011 |
| Inside the Priory of Sion: Revelations from the World's Most Secret Society - Guardians of the Bloodline of Jesus | 978-1-78028-030-1 (1-78028-030-0) | 2011 |