| Verfasser | Häufigkeit |
| Spronk, Jaap |
7 |
| Hand, John Oliver 1941- |
3 |
| Spronk, Ron 1957- |
3 |
| Spronk, J. |
2 |
| Spronk, Jacob |
2 |
| Despontin, M. |
1 |
| Fandel, Günter |
1 |
| Hout, Nico van |
1 |
| Koke, Astrid ca. 20. Jh |
1 |
| Mark, Mark |
1 |
| Matarazzo, Benedetto |
1 |
| Metzger, Catherine A. |
1 |
| Moor, Johannes Cornelis de |
1 |
| Nijkamp, P. |
1 |
| Spronk, Johannes Engelbertus Wilhelmus |
1 |
| Spronk, Johannes M. |
1 |
| Spronk, Klaas 1957- |
1 |
| Spronk, Susan |
1 |
| Spronk, Susan J. |
1 |
| Vermeulen, Erik M. |
1 |