Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) David P. Baker and Motoko Akiba and Gerald K. LeTendre and Alexander W. Wiseman,"Worldwide Shadow Education: Outside-School Learning, Institutional Quality of Schooling, and Cross-National Mathematics Achievement",Educational Evaluation and Policy Analysis,0162-3737,American Educational Research Association (AERA),2001-03,23,1,1-17,https://cir.nii.ac.jp/crid/1360292618832146688,https://doi.org/10.3102/01623737023001001