APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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