Purdue OWL: Easy-to-use citation resource. Provides rules and examples.
APA Official Website: Website of the American Psychological Association style manual.
Purdue OWL APA In-Text Basics: Covers basics of in-text citation rules and more.
Purdue OWL APA Reference List Basics: Covers basics of reference list rules and more.
Citing Artificial Intelligence:
How to Cite ChatGPT: This page from the APA Style Blog offers guidance on how (and when) to cite artificial intelligence programs such as ChatGPT
Additional Citation Examples:
Northern Michigan University APA Reference Style Guide: Contains a lot of useful examples.
APA style requires a doi. If you don't see a doi, try checking CrossRef website.