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
"Wickham, Chris","Early Medieval Italy : central power and local society, 400-1000",,University of Michigan Press,1989,Ann Arbor paperbacks,,0472080997,,https://cir.nii.ac.jp/crid/1130000797196164352