| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Idea Hierarchiæ Romanæ, Qualis Seculo XIII in Scandinavia Præsertim Exstiterit, Gestis Legationibusque Guillellmi Sabini Illustrata | 978-1-143-02320-0 (1-143-02320-X) | 2010 |
| Samlede Skrifter | 978-1-146-28554-4 (1-146-28554-X) | 2010 |