| Author | Titles | | 1.
| Rio, Maria Luísa Val do | 1 | | 2.
| Rio, Mariana, 1986- | 1 | | 3.
| Rio, Pedro | 3 | | 4.
| Rio, Rita | 1 | | 5.
| Rio, Rui | 1 | | 6.
| Río, Víctor del, 19--?- | 11 | | 7.
| Riobom, Vasco | 1 | | 8.
| Rio-Carvalho, Manuel Pedro do, 1928-1994 | 0 | | 9.
| Author is: Carvalho, Manuel Rio, 1928-1994 | 22 | | 10.
| Rioland, Stéphane | 1 | | 11.
| Riondet, Philippe | 1 |
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