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
"Echu, George and Grundstrom, Allan W.",Official bilingualism and linguistic communication in Cameroon = Bilinguisme officiel et communication linguistique au Cameroun,,P. Lang,1999,Francophone cultures and literatures,,0820440922,,https://cir.nii.ac.jp/crid/1130282272947616768