Gaya APA

Hagen, B, S, A, D, S, A. (2011). Fundamentals Of English Grammar Fourth Edition With Answer Key . United States Of America: Betty Schrampfer Azar.

Gaya MLA

Hagen, Betty, S., Azar, Dan, Stacy, A.. "Fundamentals Of English Grammar Fourth Edition With Answer Key". United States Of America: Betty Schrampfer Azar, 2011. Text.