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
"Enger, thomas P.",the world market for natural gas : macroeconomic and financial implications,,International Monetary Fund,1993,IMF paper on policy analysis and assessment,,,,https://cir.nii.ac.jp/crid/1130282270422894592