Birney, B. G., & Burris, P. (2014). Humphrey's really wheely racing day. G.P. Putnam's Sons, an imprint of Penguin Group (USA).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBirney, Betty G., और Priscilla Burris. Humphrey's Really Wheely Racing Day. New York: G.P. Putnam's Sons, an imprint of Penguin Group (USA), 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBirney, Betty G., और Priscilla Burris. Humphrey's Really Wheely Racing Day. G.P. Putnam's Sons, an imprint of Penguin Group (USA), 2014.
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