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Gaya APA

Azar, B, S. (1999). Understanding and using english grammar Third Edition (Ed. 3, Cet. Ke-1). Jakarta: Longman Person.

Gaya MLA

Azar, Betty, Schrampfer. "Understanding and using english grammar Third Edition". Ed. 3, Cet. Ke-1 Jakarta: Longman Person, 1999. Text.