| Author | Popularity |
| Batstone, Roger, 1940- |
3 |
| Boulton, James T. (James Thompson), 1924- |
3 |
| Smith, James E., 1941- |
3 |
| United Nations. Environment Programme |
3 |
| Wilson, David, 1952- |
3 |
| World Bank |
3 |
| World Health Organization |
3 |
| Abdul Rashid Aziz |
2 |
| Abdulaziz Farooq |
2 |
| Abdulla Saeed Al-Mohannadi |
2 |
| Abu-Sufian Sarkar |
2 |
| Achraf Ammar |
2 |
| Adam Owen |
2 |
| Adel Zrane |
2 |
| Alexander R. Simms |
2 |
| Alexandre Dellal |
2 |
| Alireza Rabbani |
2 |
| Anderson, James, 1905- |
2 |
| Andrea Fusco |
2 |
| Andy Schillinger |
2 |
| Anis Chaouachi |
2 |
| Antonio Dello Iacono |
2 |
| Arben Bici |
2 |
| Arporn Popa |
2 |
| Asma Aloui |
2 |
| Avishkar Pudasaini |
2 |
| Axel Urhausen |
2 |
| Axelrod, Aaron |
2 |
| Bahar Hassanmirzaei |
2 |
| Bethan J. Davies |
2 |
| Brash, J. C. (James Couper), 1886- |
2 |
| Bridges, J. W. (James Wilfrid) |
2 |
| Brown, Roger Langham |
2 |
| Bruce, James Douglas |
2 |
| Burghardt, Henry D. |
2 |
| Carl Foster |
2 |
| Carl James |
2 |
| Chaney, David |
2 |
| Christopher Martyn Beaven |
2 |
| Claus-Dieter Hillenbrand |
2 |
| Colm O Cofaigh |
2 |
| Cook, Gerald Bernard |
2 |
| Cristiano Eirale |
2 |
| Cristina Cortis |
2 |
| Cunningham, D. J. (Daniel John), 1850-1909 |
2 |
| Cvita Gregov |
2 |
| Daniel Bok |
2 |
| Daniel Boullosa |
2 |
| Danladi Ibrahim Musa |
2 |
| David B Pyne |
2 |