Kraft, L. (1976). Gradus: An integrated approach to harmony, counterpoint, and analysis. Norton.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKraft, Leo. Gradus: An Integrated Approach to Harmony, Counterpoint, and Analysis. New York: Norton, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKraft, Leo. Gradus: An Integrated Approach to Harmony, Counterpoint, and Analysis. Norton, 1976.
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