Permanent URLs?

I’m writing an academic book on a subject unrelated to pinball, but I’m using pinball machines as an analogy at one point in the book, and I’ve gotten very useful information from people here who responded to my questions. It’s possible that it would be helpful for me to add URLs of the topics I started as parts of citation information. Do does anyone know how permanent the URLs for particular topics will be (for as long as exists, at least)? Thanks-

This is where you wanna go if you want to link the thread from the start.

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A great. Thanks. Why didn’t I think of that?