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
"Kardaras, Geōrgios Th.","Byzantium and the Avars, 6th-9th century ad : political, diplomatic and cultural relations",,Brill,2019,"East Central and Eastern Europe in the Middle Ages, 450-1450",,9789004248380,,https://cir.nii.ac.jp/crid/1130282272299667328