Gaya APA
LUBIS,Yusnaini, . (1988).
DEVELOPING COMMUNICATIVE PROFICIENCY IN THE ENGLISH AS A FOREIGN LANGUAGE ( EFL ) CLASS .
Jakarta:
Depdikbud.
Gaya MLA
LUBIS,Yusnaini, .
"DEVELOPING COMMUNICATIVE PROFICIENCY IN THE ENGLISH AS A FOREIGN LANGUAGE ( EFL ) CLASS".
Jakarta:
Depdikbud,
1988.
Text.