Ridley, A. (2004). The philosophy of music: Theme and variation. The University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRidley, Aaron. The Philosophy of Music: Theme and Variation. The University Press, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRidley, Aaron. The Philosophy of Music: Theme and Variation. The University Press, 2004.
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