@Book{BVMC:618495, author = {Bertrand, Pierre}, title = {Tractatus Petri Bertrandi Cardinalis Eduensis De origine iurisditionum, seu De duabus potestatibus temporali scilicet ac spirituali}, url = {https://www.cervantesvirtual.com/obra/tractatus-petri-bertrandi-cardinalis-eduensis-de-origine-iurisditionum-seu-de-duabus-potestatibus-temporali-scilicet-ac-spirituali} }