Gaya APA

Arindri, R, F., Cemerlang, T, R. (2014). English grammar and tenses : for beginners . Yogyakarta: Andi.

Gaya MLA

Arindri, Regina, Fletianti., Cemerlang, Tim, Redaksi. "English grammar and tenses : for beginners". Yogyakarta: Andi, 2014. Text.