Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Schefold, Bertram and Edgeworth, Francis Ysidro and Keynes, John Maynard and Royal Economic Society (Great Britain)",Die Skalenertragsdebatte im Economic Journal 1922-1930,,Wirtschaft und Finanzen,2001,Klassiker der Nationalökonomie,,,,https://cir.nii.ac.jp/crid/1130000798089515776