APA Style
Azar, B, S., Hagen, S, A. (2009).
Understanding and Using English Grammar 4th Ed. (4).
America:
Pearson Longman.
MLA Style
Azar, Betty, S.., Hagen, Stacy, A..
"Understanding and Using English Grammar 4th Ed.".
4
America:
Pearson Longman,
2009.
Koleksi Buku Teks.