Withrow, J. (1987). Effective writing: Writing skills for intermediate students of american english Teacher´s Manual and answer Key. Cambridge University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWithrow, Jean. Effective Writing: Writing Skills for Intermediate Students of American English Teacher´s Manual and Answer Key. Cambridge: Cambridge University Press, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWithrow, Jean. Effective Writing: Writing Skills for Intermediate Students of American English Teacher´s Manual and Answer Key. Cambridge University Press, 1987.
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