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
"Schaff, Philip","Mediaeval Christianity : from Gregory I to Gregory VII, A.D. 590-1073",,Wm. B. Eerdmans,1968,History of the Christian church,,0802880509,,https://cir.nii.ac.jp/crid/1130282271730320128