American Association of Cardiovascular and Pulmonary Rehabilitation
http://www.aacvpr.org/

American College of Cardiology
http://www.acc.org/

American College of Cardiology. Patient Education
http://www.acc.org/media/patient/index.htm/

American Heart Association
http://www.americanheart.org/

American Journal of Hypertension
http://www.elsevier.nl/inca/publication/store/5/0/5/7/4/2/

American Society of Echocardiography
http://asecho.org/

Ask the Cardiologist
http://www.bev.net/health/cardiac/ask_cardio.html/

Atlas of Heart Diseases
http://www.norvasc-braunwald.com/

@Cardiology
http://www.cardioguide.com/

Circulation Journal of the American Heart Association
http://circ.ahajournals.org/

European Society of Cardiology
http://www.escardio.org/index.htm/

Heart Online
http://heart.bmjjournals.com/

National Cholesterol Education Program
http://www.nhlbi.nih.gov/about/ncep/index.htm/

Sociedad Española de Cardiología
http://www.secardiologia.es/

Sociedad Española de Hipertensión Arterial. Liga Española para la lucha contra la Hipertensión Arterial
http://www.seh-lelha.org/home.htm/

The Heart Surgery Forum
http://www.hsforum.com/

The Online Journal of Cardiology
http://www.mmip.mcgill.ca/heart/index.html/

The Virtual Medical Center - Cardiology & Pulmonary Center
http://www.sci.lib.uci.edu/HSG/MedicalCardio.html/

World Heart Federation
http://www.worldheart.org