Gaya APA
Azar, B, S., Hagen, S, A. (2006).
Basic English Grammar Third Edition with Answer Key (Edisi 3).
New York:
Person Longman.
Gaya MLA
Azar, Betty, Schrampfer., Hagen, Stacy, A..
"Basic English Grammar Third Edition with Answer Key".
Edisi 3
New York:
Person Longman,
2006.
Buku.