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
"Bousfield, Jonathan and Richardson, R. Dan and Broughton, Simon and Burton, Kim and Denton, Jill",Bulgaria : the rough guide,,The Rough Guides,1993,Rough guides,,1858280478,,https://cir.nii.ac.jp/crid/1130282270682445824