Cita APA (7th ed.)

Peterson, P. W. (1980). Changing times, changing tenses: A review of the English tense system. English Teaching Division, Educational and Cultural Affairs, United States Information Agency.

Cita Chicago (17th ed.)

Peterson, Patricia Wilcox. Changing Times, Changing Tenses: A Review of the English Tense System. Washington: English Teaching Division, Educational and Cultural Affairs, United States Information Agency, 1980.

Cita MLA (9th ed.)

Peterson, Patricia Wilcox. Changing Times, Changing Tenses: A Review of the English Tense System. English Teaching Division, Educational and Cultural Affairs, United States Information Agency, 1980.