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And this is why I have always hated every single jackass that responded to a question with "just Google it" even when Google didn't completely suck cock.
If I had just one single answer from a reputable source doing that, I wouldn't be asking real people. Search engines were never infallible. Niche topics have always garnered shit results.
A lot of people don't consider the future even when writing helpful posts. I'm as guilty as anyone.
If you link the correct answer, the person finding your post in 6 years better hope the link is still good. That's the legitimate reason scholarly papers needs to cite specific book editions and journal page numbers instead of using hyperlinks in a bibliography.
If a copy of the book or journal can ba tracked down, the citation will still work.
It's also why online-only published journals are still often formatted like a book with static pages instead of websites. If you find a journal article that's important, you'll likely still be able to find an achived copy in PDF somewhere even if the journal stops publishing or they change domains or whatever.