| Author | Titles | | 1.
| Rato, Vanessa | 3 | | 2.
| Rato, Vasco Moreira | 1 | | 3.
| Ratola, Francisco Simões, 1867-1949 | 1 | | 4.
| Ratos, Bonifaciano Franca | 1 | | 5.
| Rattazzi, Marie, 1833-1902 | 1 | | 6.
| Rattazzi, Marie Studolmine Letizia | 4 | | 7.
| Rattazzi, Serena | 1 | | 8.
| Rattazzi, Urbain | 1 | | 9.
| Rattemeyer, Christian | 6 | | 10.
| Rattemeyer, Volker | 5 |
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