| Author | Titles | | 1.
| Rüggeberg, Eduard Subirats | 1 | | 2.
| Rüggeberg, Eduardo Subirats , 1947- | 0 | | 3.
| Author is: Subirats, Eduardo, 1947- | 5 | | 4.
| Rüggeberg, Silvia | 1 | | 5.
| Ruggeri, Ileana, 1949- | 1 | | 6.
| Ruggeri, Rossana | 1 | | 7.
| Ruggeri, Ugo, 1941- | 5 | | 8.
| Ruggero, Cristina | 1 | | 9.
| Ruggieri, Jole | 1 | | 10.
| Ruggieri, Jole Scudieri | 1 | | 11.
| Ruggieri, Luciantonio | 1 |
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