Publication Manual of the American Psychological Association (APA), 7th ed. by 
Many of our databases provide help with APA, MLA, Chicago, & other citation styles.
In the EBSCO databases (Academic Search Complete, Historical Abstracts, PsycInfo), when you print, email, or save your citations, you can change the setting from the default "standard field format" to "citation format", and then choose the style you want.