Blumenthal, J. C. (1962). English 2600: A programed course in grammar and usage (Rev. ed.). Harcourt, Brace, and World, Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBlumenthal, Joseph C. English 2600: A Programed Course in Grammar and Usage. Rev. ed. New York ; Chicago [etc.]: Harcourt, Brace, and World, Inc., 1962.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBlumenthal, Joseph C. English 2600: A Programed Course in Grammar and Usage. Rev. ed. Harcourt, Brace, and World, Inc., 1962.
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