A DOI (Digital Object Identifier) is a unique identifier that identifies digital objects. The object, itself, may change physical locations, but the DOI assigned to that object will never change. Journal publishers are assigning DOIs to electronic copies of individual articles in journals they publish. Because the DOI insures findability for the e-journal article, citation styles (APA, MLA, Chicago Manual of Style, Turabian, etc.) are starting to request the use of a DOI in a citation for e-journal content. Below are some methods that can be used to obtain DOIs:. Resolve a DOI Name, Type or paste a DOI name, e.g., 10.1000/xyz123, into the text box below. (Be sure to enter all of the characters before and after the slash. Do not include extra characters, or sentence punctuation marks.