著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI)
VERGNAUD G.,A classification of cognitive tasks and operations of thought involved in addition and subtraction problems,Addition and Subtraction : a cognitive perspective,,Lawrence Erlbaum Associate,1982,,,39-59,https://cir.nii.ac.jp/crid/1570009751416995328,