Some online guides for APA style:
APA QUICK GUIDE - From APA, includes clearly-laid out citations the 3 most-used source types
Current APA Guide--From Tomlinson Library, updated for the 7th edition
Purdue Online Writing Lab Guide—Detailed overview of all aspects of writing and citing in APA style
https://apastyle.apa.org/instructional-aids/reference-guide.pdf