Zotero is a citation management system that will allow you to grab your citations from certain databases or webpages, and store the citation to cite in a specified format, such as APA, MLA, Chicago, and other styles.
Why bother with a citation management system? See Cite Faster: Use Zotero (2-minute video). This video will give you a great idea of how useful Zotero is!
Check out this full library guide to using Zotero to learn more:
Purchasing APA Publication Manual, 7th Edition (2020) as an Ebook
There are 2 options to purchase the APA Publication Manuals (7th edition) as an ebook. You can purchase 1-year access, or for just a little bit more money, purchase an ebook edition that you can download and that doesn't expire! There are also various print options.