Kevin Henkes. (2012). Penny and her song. Greenwillow Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKevin Henkes. Penny and Her Song. New York: Greenwillow Books, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKevin Henkes. Penny and Her Song. Greenwillow Books, 2012.
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