1. Carter A: Warning signs of heart disease. University of Michigan Health System website. http://www.med.umich.edu/1libr/aha/aha_warning_sha.htm . Updated April 13, 2005. Accessed June 27, 2005.
2. Lee TH: Planning pays off if a heart attack strikes. Harv Heart Lett 2004, 14:1–3.
3. Rudd MD, Berman L, Joiner TE, et al.: Warning signs for suicide: theory, research, and clinical application. Suicide Life Threat Behav 2006, 36:255–262.
4. Mandrusiak M, Rudd MD, Joiner TE, et al.: Warning signs for suicide and the Internet: a descriptive study. Suicide Life Threat Behav 2006, 36:263–271.
5. Rudd MD: Assessing and Managing Suicidality: A Pocket Guide. Sarasota, FL: Professional Resource Press; 2006.