Gaya APA

Hagen, B, S, A, R, S, K, S, A. (2011). Fundamentals of English Grammar Workbook . : Pearson Longman.

Gaya MLA

Hagen, Betty, Schrampfer, Azar;, Rachel, Spack, Koch;, Stacy, A.. "Fundamentals of English Grammar Workbook". : Pearson Longman, 2011. Text.