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Young, S. (2012-08-14). Putting the Pica Pieces Together. In  (Ed.), Craving Earth: Understanding Pica--the Urge to Eat Clay, Starch, Ice, and Chalk. : Columbia University Press,. Retrieved 18 Oct. 2018, from http://columbia.universitypressscholarship.com/view/10.7312/columbia/9780231146098.001.0001/upso-9780231146098-chapter-010.