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
"Cowper, Marcus. and Dennis, Peter,","Cathar castles : fortresses of the Albigensian Crusade, 1209-1300",,Osprey,2006,Fortress,,9781846030666,,https://cir.nii.ac.jp/crid/1130000796783341312