Gaya APA
Schrampfer, A., B. et al. (2006).
Basic English Grammar with answer key. Third Edition (Ed.ke-3).
New York:
Pearson Longman.
Gaya MLA
Azar, Betty, Schrampfer. et al.
"Basic English Grammar with answer key. Third Edition".
Ed.ke-3
New York:
Pearson Longman,
2006.
Textbook.