APA Style
Azar, B, S. (2009).
Understanding and using: English Grammar (Fouth Edition).
New York:
Pustaka Pelajar.
MLA Style
Azar, Betty, Schrampfer.
"Understanding and using: English Grammar".
Fouth Edition
New York:
Pustaka Pelajar,
2009.
Buku SMA Athalia.