Cita APA (7a ed.)

Peterson, P. W. (1989). Changing times, changing tenses. English Language Program Division.

Cita Chicago Style (17a ed.)

Peterson, Patricia Wilcox. Changing Times, Changing Tenses. Washington DC, l and Cultural Affairs: English Language Program Division, 1989.

Cita MLA (9a ed.)

Peterson, Patricia Wilcox. Changing Times, Changing Tenses. English Language Program Division, 1989.