| Author | Titles | 1.
| Orsini, Filippo | 1 | 2.
| Orsioli, Cleber | 1 | 3.
| Orskou, Gitte | 1 | 4.
| Orsolle, Ernest, 1858-19-? | 1 | 5.
| Orsulic, Marija | 1 | 6.
| Orta, Garcia de, 1499?-1568 | 9 | 7.
| Orta, Jorge, 1953- | 1 | 8.
| Orta, Lucy | 1 | 9.
| Ortega, Aaron Escobedo | 1 | 10.
| Ortega, Ana Teresa, 1952- | 1 |
|
|