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
"Ball, Laurence and 日本銀行金融研究所",Helicopter drops and Japan's liquidity trap,,"Institute for Monetary and Economic Studies, Bank of Japan",2008,IMES discussion paper series,,,,https://cir.nii.ac.jp/crid/1130000793889776384