1. Ali, Z. (2001). Pica in people with intellectual disability: A literature review of aetiology, epidemiology and complications. Journal of Intellectual and Developmental Disability, 26, 205–215.
2. American Psychological Association. (2000). Diagnostic and statistical manual of mentaldisorders (4th ed. Text revision). Washington, DC: Author.
3. Baltrop, D. (1966). The prevalence of pica. American Journal of Diseases in Children, 112, 116–123.
4. Barrett, R. P. (2008). Pica: Toward understanding a complication condition. The Brown University Child and Adolescent Behavior Letter, 24(6), 5–6.
5. Bell, K. E., & Stein, D. M. (1992). Behavioral treatments for pica: A review of empirical studies. International Journal of Eating Disorders, 11(4), 377–389.