What is an ISSN, ISBN, DOI or PMID?

Answer

E-resources / Digital resources
A DOI (Digital Object Identifier) or PMID (PubMed Identifier) is a unique number assigned to a digital item such as a journal article, book chapter, or dataset.

*Having a DOI or PMID allows you to access the content directly.

Journals
ISSN stands for International Standard Serial Number. It consists of eight digits and uniquely identifies a journal publication.

Books
ISBN stands for International Standard Book Number. It contains either 10 or 13 digits and uniquely identifies a book publication.

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  • Last Updated Dec 15, 2025
  • Views 0
  • Answered By Melanie Mambo

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