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
"Wilfred, Nyangena",Perspectives on poverty and resource degradation,,"Institute for Development Studies, University of Nairobi",2001,Working paper,,,,https://cir.nii.ac.jp/crid/1130282272762975744