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
"Naoumov, Nicolas and Stefanov, Ivan and Sougarev, Zdravco and Committee for International Coordination of National Research in Demography",La population de la Bulgarie,,Committee for International Coordination of National Research in Demography,1974,C.I.C.R.E.D. series,,,,https://cir.nii.ac.jp/crid/1130000794179796864