Cita APA (7th ed.)

Young, S. L. (2011). Craving earth: Understanding pica : the urge to eat clay, starch, ice, and chalk. Columbia University Press.

Cita Chicago (17th ed.)

Young, Sera L. Craving Earth: Understanding Pica : The Urge to Eat Clay, Starch, Ice, and Chalk. New York: Columbia University Press, 2011.

Cita MLA (9th ed.)

Young, Sera L. Craving Earth: Understanding Pica : The Urge to Eat Clay, Starch, Ice, and Chalk. Columbia University Press, 2011.