How do you make references accessible?

Let's suppose I have this very basic example (I could have used superscript numbers as well)

Accessibility is great*

then whatever text or content, then

* Book of obvious things

Now, how do I make the asterisk accessible so that users can access the references?

The obvious answer seems to be to use an anchor with a "reference to yadda yadda yadda" title, but it seems too invasive and obviously interrupts the flow, acting as a dialogue.

In addition, although I could use superscript numbers, when I use only one or two calls, a sign is better and more expected, especially when this is just an attention call or clarification, but not an authorized reference.

Anyways, what is the best practice for this case?