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
"Kovacheva, Vesela",The unnoticed effects of EU accession : evidence on mobility and integration of Bulgarian migrants in Germany,,Springer VS,2021,Studien zur Migrations- und Integrationspolitik,,9783658331092,,https://cir.nii.ac.jp/crid/1130288977301407373