| Verfasser | Häufigkeit |
| Rittner, Fritz 1921-2010 |
56 |
| Rittner, Tadeusz 1873-1921 |
45 |
| Rittner, Gerhard |
21 |
| Rittner, Volker |
15 |
| Rittner, Hardy 1981- |
14 |
| Rittner, Reinhard 1943- |
10 |
| Brahms, Johannes 1833-1897 |
7 |
| Rittner, Carol 1943- |
7 |
| Rittner, Christian |
7 |
| Mrazek, Joachim |
6 |
| Badura, Peter 1934-2022 |
5 |
| Rittner, Sabine 1963- |
5 |
| Rüthers, Bernd 1930-2023 |
5 |
| Rittner, Fritz |
4 |
| Rittner, Heike Lydia |
4 |
| Rittner, Thaddaeus |
4 |
| Rittner, Volker 1946- |
4 |
| Rittner, Werner |
4 |
| Rittner, Wilhelm 1694-1749 |
4 |
| Roth, John K. 1940- |
4 |