Gaya APA

Zumakhsin, . (2004). Progress 1: A Contextual Approach to Learning English an English Textbook for Senior High School Year 1 . Jakarta: Ganeca Exact.

Gaya MLA

Zumakhsin, . "Progress 1: A Contextual Approach to Learning English an English Textbook for Senior High School Year 1". Jakarta: Ganeca Exact, 2004. Text.