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 "Ruigu, George M.",Smallholder milk production and marketing : oppotunities and problems,,"Institute for Development Studies, University of Nairobi",1976,Working paper,,,,https://cir.nii.ac.jp/crid/1130000796522962432