| Verfasser | Häufigkeit |
| Link, Arthur S. 1920-1998 |
10 |
| Little, John E. |
10 |
| Mulder, John M. 1946- |
10 |
| Thomas, Milton Halsey 1903- |
10 |
| Wilson, Woodrow 1856-1924 |
10 |
| Hirst, David W |
9 |
| Fontijin, Sylvia Elvin |
6 |
| McLachlan, Jenny |
4 |
| Mulder, Lia |
3 |
| Suhre, Cor |
3 |
| Wit, Walter de |
3 |
| Blendon, Edith James |
2 |
| Fontijin, Sylvia E. |
2 |
| Doedens, Anne 1945- |
1 |
| Fontijn, Sylvia Elvin |
1 |
| Hirst, David W. |
1 |
| Mulder, A. T. |
1 |
| Mulder, Carel |
1 |
| Mulder, Jan |
1 |
| Mulder, Liek 1942- |
1 |