Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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