@Book{BVMC:625446, author = {Iglesia Católica. Papa (1227-1241: Gregorio IX)}, title = {Bullae tres Romanorum Pontificum pro reformatione et obseruantia regulari monachorum ordinis Sancti Benedicti abbatis}, url = {https://www.cervantesvirtual.com/obra/bullae-tres-romanorum-pontificum-pro-reformatione-et-obseruantia-regulari-monachorum-ordinis-sancti-benedicti-abbatis} }