| Author | Popularity |
| Alhamdan, Fahd |
2 |
| Ali, Sajid |
2 |
| Alibert, Jean Louis |
2 |
| Allafta, Hadi |
2 |
| Alles, Stefan |
2 |
| Allut, Jean |
2 |
| Alnemari, Reem M. |
2 |
| Ambreen, Ghazala |
2 |
| Amin, Muhammad Umair |
2 |
| Ammoneit, Rieke |
2 |
| Anders, Ivonne |
2 |
| Andreae, Johann Ernst |
2 |
| Andreae, Samuel |
2 |
| Antes, Peter |
2 |
| Aristoteles |
2 |
| Arndorff, Johann Heinrich |
2 |
| Arndt, Friedrich |
2 |
| Arnold, Rudolf (Prof. Dr.) |
2 |
| Arnoldus de Villa Nova |
2 |
| Arrhenius, Svante |
2 |