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 "Mavrotas, George and World Institute for Development Economics Research and United Nations University",Which types of aid have the most impact?,,"World Institute for Development Economics Research, United Nations University",2003,WIDER discussion paper,,9291905569,,https://cir.nii.ac.jp/crid/1130000793803064576