By streamlining the internal links to only the more important ones, the site would become much more usable.
Some users would benefit from the ability to increase the size of the font on the page for better readability.
Allow users to choose how compact they would like the text to be by providing a button to increase the space between words.
Include an "all internal links" page under the references tab to help users looking for specific links.
Make the references tab collapsible to prevent users from getting lost while on a page.
Improve user experience by using a color that contrasts better with the text for already clicked-on links.