| Verfasser | Häufigkeit |
| Akkerman, Jan-Willem N. |
3 |
| Akkerman, Tjitske 1949- |
3 |
| Sixma, Jan J. |
3 |
| Bouma, Bonno N. |
2 |
| Rooduijn, Matthijs |
2 |
| Akkerman, Agnes 1967- |
1 |
| Akkerman, Jan |
1 |
| Akkerman, Karel |
1 |
| Akkerman, Nadine 1978- |
1 |
| Akkerman, Nikolaj G. |
1 |
| Akkerman, Olly |
1 |
| Akkerman, Renzo |
1 |
| Akkerman, S. |
1 |
| Akkerman, Simon |
1 |
| Akkerman, Stevo |
1 |
| Broomhall, Susan 1974- |
1 |
| Daybell, James 1972- |
1 |
| De Lange, Sarah L. |
1 |
| Erler, Rainer |
1 |
| Gent, Jacqueline van |
1 |