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 "Petit, Marjorie M.",A focus on ratios and proportions : bringing mathematics education research to the classroom,,Routledge,2020,Studies in mathematical thinking and learning,,9780367370909,,https://cir.nii.ac.jp/crid/1131694359246428945