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.