:::The Croatian Encyclopedia describes the book as "controversial" and notes Novak was actually excommunicated by the CC - maybe that's worth putting in, the intro only mentions an "anathema". 
 :::After a quick scan of online sources I've found this: 
 :::* Nothing much on the book in English beyond what is already in the article (but is not fleshed out, as agreed). 
 :::* Many Croatian sources seem to mention the book only in passing. 
 :::* Negative views come largely from sources associated with the CC - no surprise there. 
 :::I'll be back with more details in a couple of days.