Selecting pages; not selecting all pages and excluding

Hi,

I am making an online math dictionary using Openstax. Since all the contents are from Openstax (at least for now), my job is to properly attribute them, I need a more efficient way of doing the citation. Their instruction is to write a particular link back to them on each page. The problem I am starting to have is when I reached the third subject i.e. Pre-algebra, College Algebra, and Precalculus. I will just have to tell what I have done so far.

I created three Elements.

a) OpenStax Citation for Prealgebra (first element)
Access for free at https://openstax.org/books/prealgebra-2e/pages/1-introduction

b) OpenStax Citation for College Algebra (second element)
Access for free at https://openstax.org/books/college-algebra-2e/pages/1-introduction-to-prerequisites

c) OpenStax Citation for Precalculus (third element)
Access for free at https://openstax.org/books/precalculus-2e/pages/1-introduction-to-functions

What I did for the first element was to create a rule to show all pages and exclude to some pages like home, terms, and conditions, etc...

For the second element, I created a rule to show on all pages BUT I have to exclude them in the first element and some pages in the second element.

For the third element, I think you know how it goes. It becomes more complex.

Is there a more elegant solution to this? I will be happy even as simple as selecting the page to which the element will be shown. Otherwise, there will be extra citations. Here's my site.

https://dictionary.chilimath.com/a-math-words/absolute-value-inequality/

-Mike