Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) 茂木 俊伸 and MOGI Toshinobu,An Analysis of “Difficult” Words in Elementary−level Japanese Language Textbooks,鳴門教育大学研究紀要,18807194,Naruto University of Education,2013-03-15,28,,343-355,https://cir.nii.ac.jp/crid/1390290699822414848,https://doi.org/10.24727/00027845