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
"Stumpf, Ulrich and Pieper, Frank",The development of the single market for postal services : comments on the Green Pape,,WIK,1992,Diskussionsbeitrag,,,,https://cir.nii.ac.jp/crid/1130282272252037632