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Creating a Bibliography: Digital Object Identifier (DOI)
Digital object identifier (DOI) is a unique alphanumeric string assigned by a registration agency (the International DOI Foundation) to identify content and provide a persistent link to its location on the Web. The publisher assigns a DOI when an article is published and made available electronically. The DOI is unique to an individual work. Not all publishers participate in the DOI initiative; therefore, an article may or may not have a DOI assigned.
All DOI numbers begin with a 10 and contain a prefix and a suffix separated by a slash. The prefix is a unique number of four or more digits assigned to organizations; the suffix is assigned by the publisher and was designed to be flexible with publisher identification standards.
Where to find the DOI?
Usually located on the first page of an electronic journal article, near the copyright notice or near the author's address.
May also be found in the Full Record Display of an article in a database, with the field labeled DOI.
Use this format for DOI in your references: doi:xxxxxxxxxxxx
Some style guides require a DOI (Digital Object Identifier ). However not every database currently supplies this.