| #21 | Acta electrotechnica et informatica. -- Košice : Fakulta elektrotechniky a informatiky Technickej univerzity, 2001-. -- ISSN 1335-8243 |
| #22 | Acta informatica. -- Berlin : Springer, 1971-. -- ISSN 0001-5903 print. -- ISSN 1432-0525 online |
| #23 | Acta Technica Napocensis, Electronică-Telecomunicaţii. -- Cluj-Napoca : Universitatea Tehnică din Cluj-Napoca, 1992-. -- ISSN 1221-6542 |
| #24 | Active Server developer's journal. -- Louisville : Cobb Group, 1997-. -- ISSN 1093-412X print. -- ISSN 1539-0330 online |
| #25 | Ad hoc networks. -- Amsterdam : Elsevier, 2003-. -- ISSN 1570-8705 print. -- ISSN 1570-8713 online |
| #26 | ADL-Nachrichten. -- GERMANY : Kiel: ADL-Verl.., 1956-1976. -- ISSN 0514-9061 |
| #27 | Adobe noviny. -- Praha : Amos Software, 1998-. -- ISSN 1803-148X |
| #28 | Advanced engineering informatics. -- Oxford : Elsevier Science, 2002-. -- ISSN 1474-0346 print. -- ISSN 1873-5320 online |
| #29 | Advanced systems. -- San Francisco : Integrated Media, 1994-. -- ISSN 1074-9306 |
| #30 | Advances in computational mathematics. -- Dordrecht : Kluwer Academic Publishers, 1993-. -- ISSN 1019-7168 print. -- ISSN 1572-9044 online |