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
Christo Bojinov and Alexander Alexandrov and Zdravko Vassiliev and Goergy Raffailov and Bojan Rossnev and Meglena Plougchieva and United Nations. Economic Commission for Europe and Food and Agriculture Organization of the United Nations,"Forest and forest products country profile , Bulgaria",,United Nations,1994,Geneva timber and forest study papers,,9211166063,,https://cir.nii.ac.jp/crid/1130282271119119360