PETERSON, P. W. (1980). Changing Times, Changing Tenses Patricia Wilcox Peterson. English teaching division educ.
Lua i Stíl Chicago (17ú heag.)PETERSON, Patricia Wilcox. Changing Times, Changing Tenses Patricia Wilcox Peterson. English teaching division educ, 1980.
Lua MLA (8ú heag.)PETERSON, Patricia Wilcox. Changing Times, Changing Tenses Patricia Wilcox Peterson. English teaching division educ, 1980.
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