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
United Nations Conference on Trade and Development,"Operation and effects of the generalized system of preferences : fourth review : selected studies submitted to the Special Committee on Preferences at its eighth session, Geneva 27 June--1 July 1977",,United Nations,1979,Document,,,,https://cir.nii.ac.jp/crid/1130282269717222528