| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The evolution of the money standard in medieval Frisia: A treatise on the history of the systems of money of account in the former Frisia (c.600-c.150 | 978-9O-367-12O2-6 (9O-367-12O2-5) | 2000 |
D,. H.. · D. J. · D. J. Henstra · J. H.