Gaya APA

Peterson, P, W. (1980). Changing times, changing tenses: a review of the English tense system . Washington: English teacing Divsion Educatioal and Cultura Affairs.

Gaya MLA

Peterson, Patricia, Wilcox. "Changing times, changing tenses: a review of the English tense system". Washington: English teacing Divsion Educatioal and Cultura Affairs, 1980. Text.