Cita APA (7a ed.)

LUBIS, Y. (1988). Developing communicative proficiency in the english asa foreign language (EFL) class. Depdikbud.

Cita Chicago Style (17a ed.)

LUBIS, Yusnaini. Developing Communicative Proficiency in the English Asa Foreign Language (EFL) Class. Jakarta: Depdikbud, 1988.

Cita MLA (9a ed.)

LUBIS, Yusnaini. Developing Communicative Proficiency in the English Asa Foreign Language (EFL) Class. Depdikbud, 1988.