Gaya APA

BARRETT, G. (2016). E-BOOK PERFECT ENGLISH GRAMMAR; THE INDISPENSABLE GUIDE TO EXCELLENT WRITING AND SPEAKING . CALIFORNIA: ZEPHYROS PRESS.

Gaya MLA

BARRETT, GRANT. "E-BOOK PERFECT ENGLISH GRAMMAR; THE INDISPENSABLE GUIDE TO EXCELLENT WRITING AND SPEAKING". CALIFORNIA: ZEPHYROS PRESS, 2016. Computer File.