Key takeaways
- A DOI is a permanent digital identifier that never breaks—even if a journal moves publishers.
- Always include DOIs in reference lists when available.
- Verify a DOI resolves at doi.org before citing a paper.
The Digital Object Identifier (DOI) is a unique permanent link assigned to published research papers, datasets, and other scholarly outputs. Understanding DOIs helps you cite correctly, verify publications, and build a credible academic profile.
What a DOI looks like and how it works
Format: doi.org/10.xxxx/xxxxx. The DOI resolves to the paper's landing page regardless of publisher URL changes. Crossref assigns most DOIs for journal articles.
Why DOIs matter
- Permanent citation link that survives website redesigns and publisher mergers.
- Required by most modern reference styles (APA 7, IEEE, Chicago).
- Proof of publication for PhD thesis bibliographies and CV entries.
- Enables accurate citation tracking in Scopus and Google Scholar.
How to find and verify a DOI
- 1Check the paper's first page or publisher landing page.
- 2Search Crossref.org by title or author.
- 3Paste the DOI into doi.org to confirm it resolves.
- 4Be suspicious of papers claiming publication without a resolvable DOI.
Citing papers with DOIs
APA 7: include DOI as hyperlink. IEEE: include DOI at end of reference entry. Always use the DOI format https://doi.org/10.xxxx/xxxxx in reference lists.