Skip to Main Content
DOIs are persistent and unique identification numbers allocated to articles, books and/or book chapters that will help you find them online.
How is a DOI different from a URL?
Unlike a URL which points to one specific location online (the content of which might alter), DOIs point to a specific piece of work regardless of where it is located online or how many different places it is located online.
Do all articles and other online materials have DOI's assigned?
It is important to note that not all articles et cetera will have DOI's assigned. This because there is a fee involved with getting a DOI code. Smaller publishing journals will often save money by not having a DOI assigned to their articles.
Where can I find the DOI on an article?
A DOI can usually be found on the front or last page of an article and will look like this...
How can I find an article via its DOI code?
To find an article via its DOI number you can use the guest query form located in Crossref: https://www.crossref.org/
How do I get a Digital Object Identifier (DOI) for my material?
You must use a service offered by a DOI Registration Agency (RA).See the list of RAs, and contact the ones whose services best meet your needs. You do not need to be a member of the International DOI Foundation in order to work with an RA.
How much does it cost to get a DOI and use the DOI system?
The cost of registering new DOI names depends on the services you purchase. Contact a DOI Registration Agency to discuss your options. Each RA is different, and each is free to offer its own business model. For an example of the costs of a DOI service for publishers, see the Crossref publisher fees. The IDF does not determine the costs charged to end users. Existing DOI names can be resolved by users free of charge.
If I have assigned a DOI name and I make a change to my material, should I assign a new DOI?
The IDF does not have any rules on this. Individual RAs adopt appropriate rules for their community and application. As a general rule, if the change is substantial and/or it is necessary to identify both the original and the changed material, assign a new DOI name.