The following are recommended citation management software tools, both free and subscription based.
Zotero: This is free and open source software but requires a download to run (Windows, MacOS, or Linux). Link to it here: https://www.zotero.org/
If you don't have the ability to run Zotero software on your device and prefer a web-based option, you might also consider ZoteroBib, which helps you build a bibliography instantly from any computer or device, without creating an account or installing any software. https://zbib.org/