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
"Hopcraft, Peter N. and Ruigu, George",Dairy marketing and pricing in Kenya : are milk shortages the consequence of droughts or pricing policies?,,"Institute for Development Studies, University of Nairobi",1976,Working paper,,,,https://cir.nii.ac.jp/crid/1130000798012209024