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 "International African Seminar and Whiteley, Wilfred Howell and Forde, Cyril Daryll",Language use and social change : problems of multilingualism with special reference to Eastern Africa,,Routledge,2018,Linguistic surveys of Africa,,9781138098350,,https://cir.nii.ac.jp/crid/1130000798357069568