it has one page of indicators in the back, yes. it would defo be too many sources to fit in print, but clearly digital makes this possible as a little clickable footnote at the bottom or similar. part of the issue is that one can't help but feel that you are competing with "attention apps", and so there's this deep incentive not to link out. my own view is that you can't succumb to this, and have to trust the reader with their own attention, but it is hard, still to push readers out of the site/app in any way