著者名,タイトル,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Kellas,Reaction-time and response variability of normal and retarded individuals,American Journal of Mental Deficiency,,,1969,74,3,409,https://cir.nii.ac.jp/crid/1370569869076917382,