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
"Dellin, L. A. D. and Free Europe Committee. Mid-European Studies Center",Bulgaria,,"Published for the Mid-European Studies Center of the Free Europe Committee, by Frederick A. Praeger",1956,East-Central Europe under the Communists,,,,https://cir.nii.ac.jp/crid/1130282271399730816