1. Anderson, D. (1989). Dorland's Pocket Medical Dictionary. Philadelphia: WB Saunders Company.
2. Baddeley, A. (1998). Human memory: Theory and practice (rev. ed.). Boston: Allyn and Bacon.
3. Carter, A. (2004). Warning signs of heart disease. Retrieved October 30, 2007, from University of Michigan Health System website: http:// www.med.umich.edu/1libr/aha/aha_warning_sha. htm
4. Youth Suicide Risk and Preventive Interventions: A Review of the Past 10 Years