A DOI (Digital Object Identifier) is a unique and never-changing string assigned to online (journal) articles, books, and other works. DOIs make it easier to retrieve works, which is why citation styles, like APA recommend including them in citations. APA Style guidelines state that DOIs should be included whenever they’re available. 

A DOI is a Digital Object Identifier. That is a Digital Identifier of an Object, not an Identifier of a Digital Object. 10.1234/456-mydoc-456584893489 is an example of the DOI format. It consists of a Prefix and a Suffix. The prefix always begins ‘10’ indicating this is a DOI name; the second part of the prefix is typically four digits, and is allocated to the DOI assigner. The suffix is created by the assigner, and can be any length and incorporate other numbering schemes (including an existing identifier) if desired. Existing data can also be linked in the DOI record.

A DOI can be assigned to any Object. An object can be anything you want to manage: a piece of online content in a particular version, or a related object, such as an author or a party to an agreement; or a physical asset, a DVD or an item of equipment, for example.

Fee Structure

Total Number of Registration

(per year)

Membership Fee Per DOI fee
<500 USD 150 USD 6.0
501 to 1000 USD 140 USD 5.75
1001 to 2000 USD 130 USD 5.50
2001 to 4000 USD 120 USD 5.25
>20000 USD 100 USD 5.00

The Publisher can contact us for registering their article with DOI. 

    DOI Request Form