$1!X$'E|!04!0-'Pp!Na'CZ!04!M"!8<!M^3BD3BD'CZs - $1!K3'0X!<cs ($1!4I!0a(B:s $1!04!9*'Q['YF!3K!JH!Nas, 2011)
Keywords: Church history -- Middle Ages, 600-1500.; Church history -- Middle Ages