@book{, address = {Perugia}, author = {Pardi, Renzo}, editor = {}, keywords = {Umbrien; Kirchengeschichte und Religionsgeschichte; Sakralbauten}, series = {}, title={Ricerche di architettura religiosa medioevale in Umbria}, uniqueid = {2256140}, url = {http://opac.regesta-imperii.de/id/2256140}, year = {1972} }