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) O'GRADY W.,A subject-object asymmetry in the acquisition of relative clauses in Korean as a second language,Studies in Second Language Acquisition,,,2003,25,3,433-448,https://cir.nii.ac.jp/crid/1570854175866249216,