| Author | Titles | | 1.
| Portocarrero y Guzmán, Pedro | 1 | | 2.
| Portoghesi, Paolo, 1931-2023 | 23 | | 3.
| Porto-Riche, Georges de, 1849-1930 | 2 | | 4.
| Port-Petit, Michel | 1 | | 5.
| Portucale | 1 | | 6.
| Portucalense Editora (Porto) | 2 | | 7.
| Portuense, Francisco Vieira, 1765-1805 | 0 | | 8.
| Author is: Vieira Portuense 1765-1805 | 5 | | 9.
| Portuense, Gouvea, 1907-1976 | 0 | | 10.
| Author is: Gouveia Portuense | 8 | | 11.
| Portuense, Gouveia, 1907-1976 | 0 | | 12.
| Author is: Gouveia Portuense | 8 | | 13.
| Portuense, Vieira, 1765-1805 | 0 | | 14.
| Author is: Vieira Portuense 1765-1805 | 5 |
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