CrossRef – the DOI search tool

Looking for the DOIs (Digital Object Identifiers) for your citations?  Crossref offers a DOI search for journal articles, books, and chapters.  Simply cut and paste the reference list into their search box.  The form will take any reference style, although it works
most reliably with standard styles.

DOIs are used to provide a stable source for information about a digital object, including where they  can be found on the Internet. Information
about a digital object may change over time, including where to find it, but its DOI name does not change.