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Citation Manual

Publication Manual of the American Psychological Association: The Official Guide to APA Style. (2020). (7th ed.).  Washington, DC: American Psychological Association
Rod Library UNI Library Services Desk BF 76.7 P83 2020, also in Reference
The authoritative guide to the APA (American Psychological Association) reference and citation system most frequently used in scholarly psychology publications. In addition, the APA Manual offers guidance in developing effective headings, tables, figures, language, and tone for scholarly communication in psychology and other disciplines using the APA style. 

APA Style Help
Prepared by experts at the American Psychological Association, these Web pages provide guidance for writing a paper in APA style and for referencing information sources using the APA citation format.  Consult the Frequently Asked Questions section for examples and explanations of commonly cited types of electronic and print resources.  Also available is an online tutorial about the basics of APA style.

APA Formatting and Style Guide (OWL Materials, Purdue University)
This resource, revised to conform to the Publication Manual of the American Psychological Association (6th ed.), provides additional interpretations and examples to help you apply the APA style.  Written by Neyhart and Karper, with the most recent editing by Brizee, this guide is part of Purdue University's OWL (Online Writing Lab) series.  Since the APA citation guidelines change, be sure to check the sources developed by the American Psychological Association itself to be sure you are using the most recent guidelines.

Digital Object Identifiers (DOIs)

The APA Publication Manual instructs you to include the digital object identifier (DOI) in references if a DOI has been assigned to the periodical article or to another type of online information source (for example, see the Manual 7.01, page 198).  A unique DOI identifies each individual article or information source (much like a Social Security number identifies each registered individual).

Here's what a DOI for a periodical article looks like:
The segment before the / is the publisher portion of the DOI. This one points to the American Psychological Association.  The segment  after the / points to the journal and specific article. 

Typically the DOI is located on the first page of an electronic journal article and is often included in PsycINFO entries when a DOI has been assigned.

The APA Publication Manual itself provides information about DOIs and locating them in section 6.31, beginning on page 187.  To learn more about DOIs also see:

Digital Object Identifiers (DOIs): How to Find DOIs in PsycINFO (online tutorial) (includes a "DOI Resolver" for identifying publication information when only a DOI is known).