著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Catholic Church. Pope ( : Gregory VII) and Gregory VII, Pope, ca. and Emerton, Ephraim",The correspondence of Pope Gregory VII : selected letters from the Registrum,,Columbia University Press,1990,Records of western civilization,,"0231005997,0231096275",,https://cir.nii.ac.jp/crid/1130282269424300288