APA Style
Hagen, S, A, S, A. (2009).
Understanding and Using English Grammar with Audio CDs and Answer Key .
U.S.A.:
Pearson Education.
MLA Style
Hagen, S., Azar, Stacy, A..
"Understanding and Using English Grammar with Audio CDs and Answer Key".
U.S.A.:
Pearson Education,
2009.
Text.