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
"Gulde, Anne Marie and Schulze-Ghattas, Marianne and Clark, Peter B.",Aggregation of economic indicators across countries : exchange rate versus PPP based GDP weights,,International Monetary Fund,1992,IMF working paper,,,,https://cir.nii.ac.jp/crid/1130000796805675520