| Author | Titles | 1.
| Roxo, Carlos de Sousa, 1935- | 14 | 2.
| Roxo, Henrique de Brito Belford | 1 | 3.
| Roxo, João | 2 | 4.
| Roxo, Maria José | 1 | 5.
| Roy, Alain | 1 | 6.
| Roy, Alastair | 1 | 7.
| Le Roy, Alexandre, Monsenhor | 1 | 8.
| Roy, Ashok | 5 | 9.
| Roy, Carolyn Parsons | 2 | 10.
| Roy, Claude, 1915-1997 | 15 |
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