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 "Schurz, Gerhard",The is-ought problem : an investigation in philosophical logic,,Kluwer Academic,1997,Trends in logic : studia logica library,,0792344103,,https://cir.nii.ac.jp/crid/1130282271321124992