To learn more about Polish anti-semitism and the historical debate about internally motivated vs German-guided violence, I would highly suggested a book by Jan T. Gross. It is called Neighbors: The Destruction of the Jewish Community in Jedwabne, Poland. It is very highly regarded by historians of the holocaust and has sparked controversial conversations within Poland and eastern Europe.

Gross is a highly awarded scholar and is an emeritus professor of history at Princeton University, so he is a very reputable source.