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  • Heart Attack -- Symptoms. Cleveland Clinic.
    http://my.clevelandclinic.org/heart/disorders/cad/mi_symptoms.aspx
  • Heart Attack Symptoms -- Different for Men and Women? Go Ask Alice.
    http://www.goaskalice.columbia.edu/2010.html
  • Heart attack symptoms: Know what signals a medical emergency. Mayo Clinic.
    http://www.mayoclinic.com/health/heart-attack-symptoms/HB00054
  • Heart Attack Symptoms and Warning Signs. American Heart Association.
    http://www.americanheart.org/presenter.jhtml?identifier=4595
  • Heart Attack Symptoms and Warning Signs. Health Central.
    http://www.healthcentral.com/heart-disease/patient-guide-44510-6.html