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
"Leidy, Michael and Dunaway, Steven",Investing U.S. social security trust fund assets in private securities,,International Monetary Fund,1997,IMF working paper,,,,https://cir.nii.ac.jp/crid/1130282272110376704