Young, S. L. (2011). Craving earth: Understanding pica : the urge to eat clay, starch, ice, and chalk. Columbia University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रYoung, Sera L. Craving Earth: Understanding Pica : The Urge to Eat Clay, Starch, Ice, and Chalk. New York: Columbia University Press, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रYoung, Sera L. Craving Earth: Understanding Pica : The Urge to Eat Clay, Starch, Ice, and Chalk. Columbia University Press, 2011.
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