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- 13 Elements
- 9mm Press
- 1st Book Library
- Aark House Publishing
- Abacus (UK)
- ABC-CLIO
- ABDO & Daughters
- Absolute Author Publishing House
- Academic Studies Press
- Academica Press
- Acme Digital
- Adam Podkowa
- Adelphil Consultancy
- Admiral House Publishing
- Adventures Unlimited Press
- Aeressa
- African Perspectives Publishing
- Agency Books
- Agio Publishing House
- Ags Wordsmiths
- Aha! Press a Howard Activity, LLC
- Air World
- Airship 27
- Airship 27 Productions
- AK Press
- Al-Mashreq Ebookstore
- Aladdin Paperbacks
- Alanthereaultauthor
- Alastair Davie
- Alex Mercer
- Alexander Tetelbaum
- Alexander Vassiliev
- Algonquin Books
- Alistern Press
- Allen & Unwin
- Allison & Busby
- Alpha Group 3 LLC
- Amazing Stories, LLC.
- Amazon Digital Services LLC - Kdp
- Amazon Publisher Hub
- Amber Publishers Company
- Amberley Publishing
- AMZ Book Publishing Services
- Anam Rasheed
- Anchor Books
- Andalus Publishing
- Andre Deutsch
- Andreas Michaelides
- Andrei Ostalski
- Andrew Kanyuka
- Angels Fortune [editions]
- Anson Street Press
- Anthem Press
- Antimeridian Press
- Any Man Publishing
- Apb Books
- Apple Tree Press
- Arcade Crimewise
- Arcade Publishing
- Arcadia Books
- Arcanaverse Books
- Archway Publishing
- Arcturus Publishing Ltd
- Arena Books Ltd
- Aria
- Arise Studio
- Armin Lear Press
- Arpress
- Arrow
- Artech House Publishers
- Arthur D. Hemmings
- Arup Ghosh
- Asiafrica Consulting (Aaco)
- Asteroid Publishing
- Athena Book Tavern
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- Atlantic Monthly Press
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- Atria Books
- Auctorem House LLC
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- Aussie Spook Press
- Austin Macauley
- Austin Macauley Publishers
- Author
- Authorhouse
- Authorhouse UK
- Authors Point
- Authorssolution.Co.UK
- Authorunion
- Autopubblicazione
- Aventine Press
- Avery Ramsey
- B.P. Stone
- Baby Professor
- BAK Books
- BN Publishing
- BONNIER ZAFFRE EXPORT
- BWL Publishing Inc.
- A. R. Goldsmith
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- Winfried Ludecke
