What is an ISSN, ISBN, DOI or PMID?
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Answer

Books, Journals, and digital resources are given unique numbers that can be used to identify them and make finding them easier.

E-resources/digital resources

DOI (Digital Object Identifier) or a PMID (PubMed Identifier) is a unique number that has been assigned to a digital object, such as an article, book chapter, or data set.

If you have the DOI or PMID for something, it can help you get directly to the content.

Journals

ISSN stands for International Standard Serial Number. ISSN's have eight digits, and each is unique to a journal publication.

Books