Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAKAHASHI Chika,Investigating the Development of Ideal L2 and L3 Selves : A Longitudinal Interview Study,Language education & technology,21857792,流山 : 外国語教育メディア学会,2017,,54,1-22,https://cir.nii.ac.jp/crid/1520009408890933760,