@article{oai:ehime-u.repo.nii.ac.jp:00001522,
 author = {TAKATSUKI, Sadao},
 journal = {愛媛大学教育学部紀要. 第II部, 人文・社会科学},
 month = {Feb},
 pages = {109--126},
 title = {Stages of Bilingual Development in a Foreign-Language Environment : A Theoretical Model},
 volume = {22},
 year = {1990}
}