Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Gary Burtless,Spending and Sources of Finance in the American Welfare State:Options for Reform(上),海外社会保障情報 = Overseas social security news,0911484X,東京 : 国立社会保障・人口問題研究所,1998-09,,124,59-88,https://cir.nii.ac.jp/crid/1520290883301683968,