My two cents
I wrote a blog article that details my setup for keeping track of references. In short I use
a notion database with a formula to "automatically" generate the reference quoted in Harvard style
short.io to shorten the URLs in a way that I can then change the URL later if the link dies.
a google sheets document with a script that checks once per week the deadlinks
A template you can re-use
I created a full notion template called "Principles Note Taker" that also contains this reference manager. Here is a video that shows more details about the reference manager:
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