PETERSON, P. W. (1980). Changing Times, Changing Tenses Patricia Wilcox Peterson. English teaching division educ.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPETERSON, Patricia Wilcox. Changing Times, Changing Tenses Patricia Wilcox Peterson. English teaching division educ, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPETERSON, Patricia Wilcox. Changing Times, Changing Tenses Patricia Wilcox Peterson. English teaching division educ, 1980.
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