| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| De interpretatievrijheid van de rechter | 978-90-6321-023-6 (90-6321-023-X) | 1979 |
| Methodologies of Legal Research | 978-1-84946-499-4 (1-84946-499-5) | 1939 |
| Methodologies of Legal Research: Which Kind of Method for What Kind of Discipline? | 978-1-84946-170-2 (1-84946-170-8) | 2011 |