| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Modals in the Languages of Europe: A Reference Work | 978-3-11-021920-3 (3-11-021920-4) | 2009 | Björn Hansen | |
| The Interaction of Modality and Negation: A Typological Study | 978-0-8153-2892-6 (0-8153-2892-3) | 1997 | ||