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 "Bartell, H. Robert and Simpson, Elizabeth T. and National Bureau of Economic Research","Pension funds of multiemployer industrial groups, unions, and nonprofit organizations",,National Bureau of Economic Research,1968,Occasional paper,,,,https://cir.nii.ac.jp/crid/1130000793666310144