| 21. AIMS Press |
| 22. AIP Publishing LLC |
| 23. Aleksandras Stulginskis University |
| 24. Alexandru Ioan Cuza University of Iași |
| 25. All India Institute of Medical Sciences |
| 26. Alliant International University |
| 27. Alma Mater Publishing House of "Vasile Alecsandri" University of Bacau |
| 28. Alpha Institute for Multicultural Studies |
| 29. Altai State University |
| 30. American Association for Cancer Research Inc. |
| 31. American Association for the Advancement of Science |
| 32. American Chemical Society |
| 33. American Institute of Mathematical Sciences |
| 34. American Institute of Physics Inc. |
| 35. American Medical Association |
| 36. American Physical Society |
| 37. American Scientific Publishers |
| 38. American Society for Biochemistry and Molecular Biology Inc. |
| 39. American Society for Dermatologic Surgery, Lippincott |
| 40. American Society for Microbiology |
