- Altberliner Verlag in der Baumhaus Buchverlag GmbH
- Altea
- Altea S A Ediciones
- Altitude Pub Canada Ltd
- Alyson Books
- Amer Education Pub
- Amer Girl
- Amer Girl Pub
- Amereon Ltd
- American Institute of Physics
- American Psychological Association (APA)
- Ameritales Entertainment Llc
- Amistad
- Ams Pr Inc
- Amulet Books
- Anaya E.L.E.
- Andersen Press
- Andersen Press Ltd
- Andre Deutsch Ltd
- Andrew Brodie
- Andrews McMeel
- Angel Gate
- Animal Planet
- Anime Video
- Anness Pub
- Annick Pr
- Annick Press
- Answers in Genesis
- Apple
- Applewood Books
- Arcade Publishing
- Arco Pub
- Arcturus Pub
- Arden Shakespeare
- Ariel
- Aro Pub
- Arquetipo Grupo Editorial S A
- Arrow (Young)
- Arrow Books
- Arrow Pr
- Art & Image
- Artes De Mexico Y Del Mundo S.A.
- Artesian Pr
- Arthur A. Levine Books
- Arthur a Levine
- Artisan
- Ashgate Pub Co
- Ashgate Pub Ltd
- Ashleyalan Enterprises
- Aspen Law & Business
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