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 "Pennings, F. (Frans)",European social security law,6th ed,Intersentia,2015,Ius communitatis series,,"9781780682761,9781780683102",,https://cir.nii.ac.jp/crid/1130000794203406336