| Author | Titles | | 1.
| Onfray, Michel, 1959- | 3 | | 2.
| Ongania, F., 1842-1911 | 0 | | 3.
| Author is: Ongania, Ferdinando, 1842-1911 | 1 | | 4.
| Ongania, Ferdinando, 1842-1911 | 1 | | 5.
| ONGD Plataforma Portuguesa | 1 | | 6.
| Onians, John, 1942- | 3 | | 7.
| ONICIU, A.P. | 1 | | 8.
| Onieva, Antonio J. | 1 | | 9.
| Onik, Sahakian, 1936- | 3 | | 10.
| Onions, C. T. | 2 | | 11.
| Onís, Federico de | 2 |
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