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 "Clay, Daniel C. and Guizlo, Mark and Wallace, Sally and Environmental and Natural Resources Policy and Training Project",Population and land degradation,,Environmental and Natural Resources Policy and Training Project,1994,Working paper,,,,https://cir.nii.ac.jp/crid/1130000798394207488