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
"Abulafia, David",The two Italies : economic relations between the Norman kingdom of Sicily and the northern communes,,Cambridge University Press,1977,Cambridge studies in medieval life and thought,,0521212111,,https://cir.nii.ac.jp/crid/1130000796210976768