63.Aspirin for the Prevention of Cardiovascular Disease, Topic Page. December 2009. U.S. Preventive Services Task Force. http://www.uspreventiveservicestaskforce.org/uspstf/uspsasmi.htm
64.Furie KL, Goldstein LB, Albers GW, Khatri P, Neyens R, Turakhia MP, Turan TN, Wood KA; American Heart Association Stroke Council; Council on Quality of Care and Outcomes Research; Council on Cardiovascular Nursing; Council on Clinical Cardiology; Council on Peripheral Vascular Disease. Oral antithrombotic agents for the prevention of stroke in nonvalvular atrial fibrillation: a science advisory for healthcare professionals from the American Heart Association/American Stroke Association. Stroke. 2012 Dec;43(12):3442-53. http://www.ncbi.nlm.nih.gov/pubmed/22858728