Gaya APA

LUBIS, Y. (1988). DEVELOPING COMMULATIVE PROFICIENCY IN THE ENGLISH AS A FOREIGN LANGUAGE (EFI) CLASS . Jakarta :: DEPPENBUD.

Gaya MLA

LUBIS, YUSNAINI. "DEVELOPING COMMULATIVE PROFICIENCY IN THE ENGLISH AS A FOREIGN LANGUAGE (EFI) CLASS". Jakarta :: DEPPENBUD, 1988. Text.