| Author | Titles | | 1.
| Appold, Olff | 1 | | 2.
| Appolonia, Giulia, 1969- | 2 | | 3.
| Apps, Martin | 2 | | 4.
| Appuhn, Charles, 1820-1872 | 6 | | 5.
| Aprá, Alberto | 1 | | 6.
| Aprá, Alberto Carlos, 1871- ? | 11 | | 7.
| Aprà, Nietta | 2 | | 8.
| Apruzzese, Enzo, 1956- | 1 | | 9.
| Apte, Savita | 2 | | 10.
| Aptel, Claire | 1 |
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