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- 2000 AD
- 4 Horsemen Publications
- 4 Horsemen Publications, Inc.
- 1889 Labs Ltd
- 1st Book Library
- 1st World Library
- 4star Scifi
- 12th Media Services
- 4 Wing Press
- 13 Worlds
- A-Girl Studio
- A. J. Ross
- Abdul Ahad Ansari
- Absolute Author Publishing House
- Academic Press
- Accepted, Inc.
- Ace Books
- Ace of Swords
- Ace of Swords Publishing
- ACM Books
- Acorn Books
- Adamant Entertainment
- Adaptor Studio Dave Welch
- Adler Press
- Adventures with Ink
- Adzo Publishing
- Aerani-Verlag
- Aesterlight Steampunk Studios LLC
- Affront Publishing
- Afnil
- Afolabi Onadipe
- Agenzia ISBN
- AIA Publishing
- Airship
- AK Press
- Alessandro Schumperlin
- Alethea in Heart
- Alex C. Wolf
- Alex O. Harb
- Alex Van Hoogstraten
- Alexsander Cristea
- Alfred A. Knopf Books for Young Readers
- Alfred Music
- Alicia King Anderson
- Allen Jervey
- Ally Campanozzi
- Altwit Press
- Am I Am
- Amanda Babcock
- Amberjack Publishing
- Amberley Publishing
- American Library Association
- American Literatures Initiative
- Amy Braun
- Anatiposi Verlag
- Ancient Wisdom Publications
- Andre R
- Andrea K\Hosth
- Andrews UK Limited
- Ang'dora Productions, LLC
- Angelika Sommer
- Angelique S. Anderson
- Angry Robot
- Ankit Bhandawat
- Anne Renwick
- Annemarie Nikolaus
- Anson Street Press
- Anthem Press
- Anti-Oedipus Press
- Antillas Publishing House
- Anu E Press
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- Anyael Stormbright
- Apex Test Prep
- Apocryphile Press
- Applause Theatre & Cinema Book Publishers
- Apress
- Aradia Publishing
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- Arcturus Publishing
- Arcturus Publishing Ltd
- Arkose Press
- Art of the Genre
- As the Crow Flies Publishing
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- Ateneo de Manila Univ Press
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