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
"Williamson, Craig and Shippey, T. A.",Beowulf and other Old English poems,,University of Pennsylvania Press,2011,Middle Ages series,,9780812222753,,https://cir.nii.ac.jp/crid/1130282273328501376