with Mark, find the best one you can. 914 is like a lego set, get the best set you can afford and latter you can add pieces to make it yours.
But for a list of books, the most informative one is this one, and it too has of mis-information about our beloved 914. As a general read about the car and its history.
Click to view attachmentClick to view attachmentClick to view attachmentClick to view attachmentClick to view attachmentI would like to find the 914 Sportswagen and restore it, talk about rare.
Only catch is you need to be able to read German or know someone who is willing to translate or read you a bed time story.
As far as technical books go.
I find the Parts diagram to be indispensable !!!!!!
Factory manuals are nice to have also.
After that you are correct I have an additions 20 books on the 914 exclusively, and another 40 or so that mention it in a descriptor or briefly.