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This template formats 9-digit SBN's, 10- and 13-digit ISBNs according to the rules determined by the International ISBN Agency.[1]
- ^ "Structure of the ISBN" (PDF). ISBN Users' Manual: International Edition (7th ed.). London: International ISBN Agency. 2017. pp. 11–12. ISBN 978-92-95055-12-4 – via Kungliga Biblioteket.
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