Bowker (MyIdentifiers)
Official US ISBN agency. Relevant if your publishing entity is US-based. UK authors should normally buy from Nielsen instead of Bowker.
ISBNs, identifiers & legal
ISBN agencies, identifiers, and related publishing setup for UK and global authors.
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Nielsen ISBN Agency (UK & Ireland)
Official ISBN agency for the UK and Ireland. Buy your own ISBNs if you want your imprint listed as publisher (rather than a platform-assigned free ISBN). Not legally mandatory to publish, but expected for bookstore/libra…