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 "Crouch, David",The Beaumont twins : the roots and branches of power in the twelfth century,,Cambridge University Press,1986,Cambridge studies in medieval life and thought,,0521302153,,https://cir.nii.ac.jp/crid/1130282272605816320