@article{oai:toin.repo.nii.ac.jp:00000558,
 author = {阿部, 憲二},
 issue = {30},
 journal = {桐蔭論叢, Research bulletin, Toin University of Yokohama},
 month = {Jun},
 pages = {29--38},
 title = {What is the advanced oral proficiency level in English as a Second Language (ESL)?},
 year = {2014},
 yomi = {アベ, ケンジ}
}