Yorkey, R. C. (1984). New Intercom: Workbook (3rd ed.). Heinle and Heinle.
Chicago Style (17th ed.) CitationYorkey, Richard C. New Intercom: Workbook. 3rd ed. Boston: Heinle and Heinle, 1984.
MLA (9th ed.) CitationYorkey, Richard C. New Intercom: Workbook. 3rd ed. Heinle and Heinle, 1984.
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