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 European Commission and European Commission. Directorate-General for Regional Policy and Cohesion,Sixth periodic report on the regions : summary of the main findings,,"European Commission, Directorate-General for Regional Policy and Cohesion (DG XVI)",1999,Inforegio,,,,https://cir.nii.ac.jp/crid/1130000796921194496