Title: Nŭngnyŏkpyŏl hoejŏn suŏp ŭi hyokwa e kwanhan il yŏnʾgu : chunghakkyo yŏngŏ suhakkwa rŭl chungsim ŭro /
Authors: Yi, Kye-sŏng.
Year: 1971
Subjects: Ability grouping in education Korea.; Education, Secondary Korea Curricula.