| Author | Titles | | 1.
| Beltrami, Lucas | 1 | | 2.
| Beltramini, Guido | 1 | | 3.
| Beltramo, Claudia | 1 | | 4.
| Beltrán, António, 1916-2006 | 0 | | 5.
| Author is: Beltrán Martínez, Antonio, 1916-2006 | 16 | | 6.
| Beltrán Catalán, Clara | 1 | | 7.
| Beltrán de Heredia, Itxaro Delgado | 1 | | 8.
| Beltrán, Elvira | 1 | | 9.
| Beltrán, Félix | 1 | | 10.
| Beltrán Fortes, José | 1 | | 11.
| Beltrán, José-Carlos | 1 |
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