Kraft, L. (1976). Gradus - Book II An integrated approach to harmony, counterpoint, and analysis. W. W. Norton & Company Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKraft, Leo. Gradus - Book II An Integrated Approach to Harmony, Counterpoint, and Analysis. W. W. Norton & Company Inc, 1976.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKraft, Leo. Gradus - Book II An Integrated Approach to Harmony, Counterpoint, and Analysis. W. W. Norton & Company Inc, 1976.
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