The APA style guide is widely used withing the behavioral and social sciences as a set of standards for writing, formatting papers, and citations. The Publication Manual of the American Psychological Association - 7th edition is the current authoritative source. There are two primary web sources that support the APA style guide: the APA's Style & Grammar Guidelines website and the Purdue OWL (online writing lab).
APA Style & Grammar Guidelines
Formatting and Style Guide at Purdue OWL
Publication Manual of the APA 7th ed. - BPCC library
The Purdue OWL has detailed descriptions on how to format a paper based on APA as well as a sample of a paper based on APA. These cover topics such as spacing, margins, page numbers, organization, headings, in-text citations, end notes, quotations, and punctuation.
Every source used in a paper must be cited within the paper itself. In-text citations, footnotes, and endnotes are how those sources are identified and linked to the "References" page. There are multiple ways to include in-text citations using APA. The following links provide detailed explanations.
Purdue OWL - Footnotes and Endnotes
All sources that are cited within a paper must be listed at the end of the paper in the "References" page. The APA style is very specific about the way this list is formatted and presented. The following links provide in-depth explanations of how to create a "References" page.