WE HAVE A SOLUTION TO THIS, THEY ARE CALLED FOOTNOTES.
"COME OUT COME OUT AND FLIP TO THE BACK OF THE FUCKING BOOK AND SEARCH FOR THE TINY NUMBER. OH YOU HAVE A PDF? THEN FUCK YOU AND YOUR FUCKING LIFE" - DERANGED SICKO PUBLISHERS
Under communism, endnotes will be banned and punishable by law.
My eBook reader (KOReader) converts endnotes to dynamic (pop-up) footnotes. Works almost all the time.
I do like that function. I can't highlight in the pop-up on my kindle, which is annoying. Only works with ebooks tho, and finding or citing things in ebboks is annoying as the page numbers get all weird. Location 4657????