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Digital Object Identifier (DOI)

A unique number that enables quick and persistent locating of online content.

Video: How to Find DOIs in APA PsycInfo

A Digital Object Identifier or DOI refers to a management system used to identify online content in a way that it can be reliably located on digital networks. These numbers are unique for each item and consist of a long alphanumeric code.

An example of a DOI is 10.1016/0022-1910(82)90103-2. For online articles, the URL to the article might change over time leading to errors and failure to retrieve the article. The DOI number will never change and reflects a more permanent and reliable method for accessing the article. Wherever possible, include the DOI number in citing articles from online sources.

Many publishers provide the DOI for an article right on the first page. Articles in the ScienceDirect database display the DOI just above the article title. In most cases, the page containing the full text of the article will also include the DOI.

If you already have bibliographic data and just need to find the DOI, use the free DOI lookup.