Gaya APA
AZAR, B, S., Hagen, S, A. (2006).
Basic English Grammar with Answer Key (3rd ed.).
New York:
Pearson Education.
Gaya MLA
AZAR, Betty, Schrampfer., Hagen, Stacy, A..
"Basic English Grammar with Answer Key".
3rd ed.
New York:
Pearson Education,
2006.
Text.