@article{oai:barrel.repo.nii.ac.jp:00000637, author = {Caluianu, Daniela and Holst, Mark}, journal = {小樽商科大学人文研究}, month = {Mar}, pages = {79--98}, title = {Success factors in the acquisition of English as a second language: Class language and self-confidence}, volume = {115}, year = {2008} }