| Author | Titles | | 1.
| Ottmann, Richard Eduard | 1 | | 2.
| Otto | 1 | | 3.
| Otto, Christian F. | 1 | | 4.
| Otto, Dean | 1 | | 5.
| Otto Dix, 1891-1969 | 0 | | 6.
| Author is: Dix, Otto, 1891-1969 | 6 | | 7.
| Otto, Emil | 2 | | 8.
| Otto, Emílio | 1 | | 9.
| Otto, Ernst | 1 | | 10.
| Otto, Frei, 1925-2015 | 3 | | 11.
| Otto, George | 1 |
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