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
"Keithly, David M.",Breakthrough in the Ostpolitik : the 1971 Quadripartite Agreement,,Westview Press,1986,Westview special studies in international relations,,0813371783,,https://cir.nii.ac.jp/crid/1130000794994629632