| Author | Titles | | 1.
| Plácido, José | 1 | | 2.
| Plácido, José António, 1959- | 3 | | 3.
| Plácido, Laurentino | 1 | | 4.
| Plácido, Manuel Alves, Padre | 1 | | 5.
| Plácido, Mide, 1957- | 2 | | 6.
| Placito, P. J. | 1 | | 7.
| Placzek, Adolf K. | 2 | | 8.
| Pladevall, Enric, 1951- | 1 | | 9.
| Plagens, Peter | 2 | | 10.
| Plagnieux, Philippe | 2 |
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