Peterson, P. W. (1999). Changing perspectives - A review of the english tense system. U.S.: United States Information Agency.
استشهاد بنمط شيكاغوPeterson, Patricia Wilcox. Changing Perspectives - A Review of the English Tense System. U.S.: United States Information Agency, 1999.
MLA استشهادPeterson, Patricia Wilcox. Changing Perspectives - A Review of the English Tense System. U.S.: United States Information Agency, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.