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 "Gstöhl, Sieglinde and Schunz, Simon","The external action of the European Union : concepts, approaches, theories",,Macmillan International Higher Education : Red Globe Press,2021,The European Union series,,9781352012125,,https://cir.nii.ac.jp/crid/1130573251270341019