Registering references means submitting reference lists as part of your metadata deposit. It is optional but strongly encouraged (especially if you use our Cited-by service) and any references you include in your Crossref metadata will be made available through our APIs, including Event Data.


  • supply DOIs with your references! This is the most effective way to identify and connect the references supplied with your content metadata.
  • supply a full reference or complete marked up metadata for every citation that you do not have a DOI for - we do our best to match these citations to registered DOIs.
  • cite data, software, and other materials used to support and supplement the content being registered

Do not:

  • omit non-Crossref DOIs from your references - this eliminates data, software, and other types of citations from our records. We aren’t able to match citations to non-Crossref DOIs, but we do pass them along to our APIs and they are used by our metadata subscribers.

Review our References Markup Guide for XML and metadata help.

Page owner: Patricia Feeney   |   Last updated 2022-June-01