| Author | Titles | | 1.
| Firmino, Jorge, 1973- | 1 | | 2.
| Firmino, Nicolau, 1907-2001 | 21 | | 3.
| Firmo, Catarina | 1 | | 4.
| Firmo, Joaquim Ferreira dos Santos | 2 | | 5.
| Firmo, Luís | 5 | | 6.
| Firmo, Matias José de Oliveira dos Santos | 1 | | 7.
| Firmo, Yheo | 1 | | 8.
| Firpo, Luigi | 1 | | 9.
| First Center for the Visual Arts (Naschville, Estados Unidos) | 1 | | 10.
| First World Environmemtal Education Congress, Espinho, 2003 | 2 |
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