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
"Kaufmann, J. E. and Kaufmann, H. W.",The neutral states : Netherlands Belgium and Switzerland,,Pen & Sword Military,2014,The forts and fortifications of Europe 1815-1945,,9781783463923,,https://cir.nii.ac.jp/crid/1130003901633272961