Okay, but what if the author refers to a page number in a paper book, and you only have access to a different version of that paper book? That’s not a new problem.
No, it’s not, and the solution is to specify the edition you’re citing. And of course in this magical world we live in, if you don’t have that edition you may be able to use Google Books to find where it is in your own edition. There are no easy or universal solutions, but ignoring paper books means not even trying.