Gaya APA

Lou, R. (2011). Workbook 1 for elementary-intermediate learners of English around the world English grammar and how to use it: a simple and clear explanation of important points of English grammar with lots of exercises with an answer key . Jakarta: Mobile English Eplus.

Gaya MLA

Lou, Robby. "Workbook 1 for elementary-intermediate learners of English around the world English grammar and how to use it: a simple and clear explanation of important points of English grammar with lots of exercises with an answer key". Jakarta: Mobile English Eplus, 2011. Textbook.