Henkes, K. (2015). Penny and her marble: I can read level 1. Greenwillow Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHenkes, Kevin. Penny and Her Marble: I Can Read Level 1. New York: Greenwillow Books, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHenkes, Kevin. Penny and Her Marble: I Can Read Level 1. Greenwillow Books, 2015.
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