| Author | Titles | | 1.
| Adeo (Firma) | 1 | | 2.
| ADEPA (Alcobaça, Portugal) | 1 | | 3.
| Ader, Bas Jan, 1942-1975 | 6 | | 4.
| Ader, Basjan, 1942-1975 | 0 | | 5.
| Author is: Ader, Bas Jan, 1942-1975 | 6 | | 6.
| Ader, Bastiaan Johan Christiaan, 1942-1975 | 0 | | 7.
| Author is: Ader, Bas Jan, 1942-1975 | 6 | | 8.
| Ader, Étienne | 2 | | 9.
| Aderne, Isa, 1923- | 1 | | 10.
| Ader-Sousa Associação de Desenvolvimento Rural das Terras de Sousa (Felgueiras, Portugal) | 1 | | 11.
| Adert, Laurent | 2 | | 12.
| Ades, Dawn, 1943- | 25 |
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