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 "Meyer, Ronny and Richter, Renate",Language use in Ethiopia from a network perspective : results of a sociolinguistic survey conducted among high school students,,P. Lang,2003,Schriften zur Afrikanistik = Research in African studies,,3631502591,,https://cir.nii.ac.jp/crid/1130282270300652160