| Author | Titles | 1.
| O'Neill, Alexandre Delgado, 1959-1993 | 2 | 2.
| O'Neill, Alistair | 1 | 3.
| O'Neill, Amanda, 1951- | 1 | 4.
| O'Neill, Brian Juan | 3 | 5.
| O'Neill, Cathy | 1 | 6.
| O'Neill, Eugéne | 2 | 7.
| O'Neill, Henrique | 1 | 8.
| O'Neill, John | 1 | 9.
| O'Neill, John Philip, 1931- | 15 | 10.
| O'Neill, José | 1 |
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