Gaya APA

Peterson, P, W. (1996). Practical American English Series: Changing Times, Changing Tenses... [Elementery Level] . Jakarta: Gramedia Pustaka Utama.

Gaya MLA

Peterson, Patricia, Wilcox. "Practical American English Series: Changing Times, Changing Tenses... [Elementery Level]". Jakarta: Gramedia Pustaka Utama, 1996. Text.