 ::it is not censorship, I did not tag the entire list as POV. I think there should be an introduction and I suggested a manner that would allow this to happen. Listing all the books you can find on the subject doesn't make an introduction. You need to indicate the information from the books or otherwise they are references. As discussed in the CfD History, Jews and Chess and Chess in Jewish History and Hebrew Literature are both the same dissertation. It should also be noted that Oxford Academia Publishers is clearly a dubious publisher. It is a mistake to blend RS with questionable sources. My objection to the use of extensively because there is not actually the evidence to support this as being extensive by scientific standards where you commonly get works with citations in the 100s and 1000s.  