Publishers
- Anthony Nelson Ltd. 1
- Antique Collectors' Club 9
- Antonio Delfino Editore 1
- Anuart Ediciones 1
- Apach Publishing 1
- Apecs Press 1
- Aperture 1
- Apple Press 1
- Apple Tree Press 1
- Applied Science Publishers Ltd. 3
- Apress 1
- Aquarian Thorsons 1
- Arandar Books Ltd. 2
- Arbeit Munich 1
- Arbor House 1
- Arcadia 4
- Arch 1
- Archaeologia Cambrensis 1
- Archangel Press 2
- Archibald Constable & Co. Ltd. 4
- Archibald Constable And Co. 3
- Archibald Constable And Company 1
- Archipelago Press 1
- Architectural And Archaeological Society Of Durham And Northumberland 1
- Archon Books 2
- Arco 1
- Arco Publications 2
- Arco Publishing 4
- Arcos Verlag 1
- Arctic Fox Books 1
- Arden Publishing Co. Ltd. 1
- Argosy-Antiquarian Ltd. 1
- Argraffdy'R Methodistiaid Calfinaidd 1
- Argus Books 4
- Argyll Bird Club 1
- Argyll Publishing 1
- Arkstee & Merkus 1
- Arlington Books 2
- Armada 20
- Arms & Armour Press 26
- Army Apprentices College Chepstow 1
- Arnold 3
- Arnold Wheaton 2
- Arnoldo Mondadori 2
- Arnoldsche 1
- Arrow Publishing 1
- Arrowsmith 1
- Art & Educational Publishers Limited 2
- Art & Humour Publishing Co. 1
- Art & Humour Publishing Co. Ltd. 1
- Art Books International 1
- Art Gallery Of Alberta 1
- Art Revisited 1
- Art Services International 2
- Artabras 1
- Artech House 1
- Artes Mundi 1
- Arthur Ackermann 1
- Arthur Barker Limited 8
- Arthur Barker Ltd. 6
- Arthur Barron Ltd. 2
- Arthur H. Stockwell Ltd. 5
- Arthur L. Humphreys 1
- Arthur Wigley & Sons Ltd. 1
- Arti Grafiche Gajani 1
- Arti Grafiche Saturnia 1
- Artia 1
- Artima 1
- Artis-Historia Publishing 1
- Artists' Choice Editions 1
- Arts and General Publishers Ltd. 1
- Artur Wolf 2
- Ashford 1
- Ashford Press Publishing 1
- Ashgate 4
- Ashgate Publishing Company 3
- Ashgrove Press 1
- Ashley James Limited 1
- Asia Publishing House 2
- Asiatype, Inc. 1
- Aslib 2
- Aspect Corp. 1
- Associacio Per A La Defensa De La Natura 1
- Associated Newspapers 1
- Associated Newspapers Ltd. 2
- Associated University Press 1
- Aston Martin 1
- Aston Publications 19
- Atelier Books 1
- Atheneum 2
- Atlantic Books 7
- Atlantic Monthly Press 1
- Atlantic Publishers 4
- Atlantic Transport Publishers 4
- Atlas Books 1
- Atrium Press Ltd. 2
- Audi Ag 1
- Augener Ltd. 13
- Augustus M. Kelley 3
- Aurora Art Publishers 3