Publication Manual of the American Psychological Association by "APA Style® originated in 1929, when a group of psychologists, anthropologists, and business managers convened and sought to establish a simple set of procedures, or style rules, that would codify the many components of scientific writing to increase the ease of reading comprehension.
As with other editorial styles, APA Style consists of rules or guidelines that a publisher observes to ensure clear and consistent presentation of written material. It concerns uniform use of such elements as
(Source: Official APA website)
This guide includes content adapted with permission from the librarians at the University Library System, University of Pittsburgh. Lakeland guide creator: Joe Pirillo. Currently maintained by Ann Penke.
In order to simplify when to use a DOI (Digital Object Identifier) and a URL (Uniform Resource Locator) in your citations, APA has posted a flow chart online: