| Author | Titles | | 1.
| Koester, Joachim, 1962- | 1 | | 2.
| Koester, Olaf | 1 | | 3.
| Koestlé-Cate, Jonathan | 1 | | 4.
| Koestler, Arthur, 1905-1983 | 4 | | 5.
| Koether, Jutta, 1958- | 4 | | 6.
| Koetter, Fred | 2 | | 7.
| Koetz, Edgar | 1 | | 8.
| Koetz, Sergio | 1 | | 9.
| Koetzle, Hans-Michael | 3 | | 10.
| koetzle, Michael | 1 |
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