Gaya APA
AZAR, B, S.
(1999).
UNDERSTANDING AND USING ENGLISH GRAMMAR
(
3RD EDITION)
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NYC:
LONGMAN.
Gaya MLA
AZAR, BETTY, SCHRAMPFER.
"UNDERSTANDING AND USING ENGLISH GRAMMAR".
3RD EDITION
NYC:
LONGMAN,
1999.
PENDIDIKAN BAHASA INGGRIS.