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Support with ISBN and DOI

isbn doi

What is DOI?

A Digital Object Identifier (DOI) is a unique number that can be assigned to a digital document. A document that has been assigned a DOI can always be found online in a standard way, even if the IP address changes.

Each DOI consists of

  • a unique part that is assigned to the University of Groningen Library by the registration agency CrossRef: 10.21827/       
  • a free part, which is randomly generated by the University Library for each document.

The combination of these two parts results in a globally unique code.

The University of Groningen Library will start assigning DOIs to privately published journals and journal articles in the course of 2017, after which more digital documents will follow.

For more information please contact Margreet Nieborg.   

What is ISBN?

An International Standard Book Number (ISBN) is a unique code that is assigned to book publications to make them easier to find. Each ISBN contains 13 digits. For more information, please go to the Bureau ISBN website.

University of Groningen PhD students or staff members can request an ISBN for their thesis or University publication free of charge through the University Library by completing an ISBN request form.

  • For publications that are to appear both electronically and as a hardcopy version you will have to request two ISBNs.
  • The University of Groningen Library will assess your application and then send you the requested ISBNs by e-mail.
  • Any questions? Please feel free to contact us at
    tel.: 050 363 5034
Last modified:17 January 2017 1.40 p.m.
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