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
,"Eketorp : fortification and settlement on Öland, Sweden",,"Royal Academy of Letters, History and Antiquities : Almqvist & Wiksell International",1976,,,,,https://cir.nii.ac.jp/crid/1130282271867386624