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
University of Illinois (Urbana-Champaign campus). Bureau of Economic and Business Research,The operating and earning power ratios of gas companies : studies in financial structure,,University of Illinois,1931,University of Illinois bulletin,,,,https://cir.nii.ac.jp/crid/1130000796766603648