Hopman, P. (2012). Valentine and his violin. Lemniscaat USA.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHopman, Philip. Valentine and His Violin. New York, NY: Lemniscaat USA, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHopman, Philip. Valentine and His Violin. Lemniscaat USA, 2012.
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