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 "Norton, Bryan G. and University of Maryland, College Park. Center for Philosophy and Public Policy",Why preserve natural variety?,,Princeton University Press,1987,"Studies in moral, political, and legal philosophy",,069102507X,,https://cir.nii.ac.jp/crid/1130000796341329280