Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) "SAKURAI,Daiki",Quantitative Analysis of Graded High School English Textbooks -A study of grammar and modal verbs-,文学研究論集,1340-9174,明治大学大学院,2024-02-28,60,,1-19,https://cir.nii.ac.jp/crid/1050581148772049152,