Duckworth, W. (2009). A creative approach to music fundamentals (Rev. ed.). Schirmer Cengage Learning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuckworth, William. A Creative Approach to Music Fundamentals. Rev. ed. Boston, Mass: Schirmer Cengage Learning, 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDuckworth, William. A Creative Approach to Music Fundamentals. Rev. ed. Schirmer Cengage Learning, 2009.
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