- Smith & Sons
- Smithsonian Institution
- Snap Books
- Snicket
- Social Studies Collections
- Sodis
- Soft Skull Press/Red Rattle Books
- Soho Teen
- Somerville
- Somos Ninos
- Sono Nis Pr
- Soundprints
- Sourcebooks
- Sourcebooks Inc
- Sourcebooks Jabberwocky
- South-Western Pub
- Sovereign World Ltd
- Spark Pub Group
- Speak
- Special Book Services Livraria Ltd
- Spectrum
- Speech Kids Texas Pr
- Spektrum Akademischer Verlag
- Spes Editorial
- Sphere
- Sphinx Pub
- Splendid Film
- Spoken Arts
- Spoken Language Services
- Sports Illustrated
- Spotlight
- Springer
- Springer Palgrave Macmillan
- Springer VS
- Square Fish
- Squawk Books
- St Anthony Messenger Pr
- St Editorial
- St Martins Pr
- St Marys Pr
- St. Martin's Griffin
- St. Martin's Press
- Standard Pub
- Stanford University Press
- Star Bright Books
- Starfire
- Stargazer Books
- Stargazer Pr
- Starscape
- Starscape Books
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