-Artaza, Jorge N., Rajnish Mehrotra, and Keith C. Norris. "Vitamin D and the
Cardiovascular System." Clinical Journal of the American Society of Nephrology.
Web. .
-Holick, Michael F. "High Prevalence of Vitamin D Inadequacy and Implications for
Health." Mayo Clinic Proceedings. Mayo Clinic. Web. .
-Holick, Michael F. "Sunlight and Vitamin D for Bone Health and Prevention of
Autoimmune Diseases, Cancers, and Cardiovascular Disease." The American
Journal of Clinical Nutrition. Web. 21 Nov. 2011. .
-Lee, John H., James H. O'Keefe, David Bell, Donald D. Hensrud, and Michael
F. Holick. "Vitamin D Deficiency: An Important, Common, and
Easily Treatable Cardiovascular Risk Factor." Journal of the American
College of Cardiolog 52.24 (2008): 1949-956. Journal of the American
College of Cardiology. Web. .
-Martins, David, Myles Wolf, Deyu Pan, Ashraf Zadshir, Naureen Tareen, Ravi
Thadhani, Arnold Felsenfield, Barton Levine, Rajnish Mehrotra, and Keith
Norris. "Prevalence of Cardiovascular Risk Factors and the Serum Levels of 25-
Hydroxyvitamin D in the United States: Data From the Third National Health
and Nutrition Examination Survey -- Martins Et Al. 167 (11): 1159 -- Archives
of Internal Medicine." Archives of Internal Medicine, a Bimonthly Peer-reviewed
Medical Journal Published by AMA. Archives of Internal Medicine. Web. 21
Nov. 2011. .
-Pittas, Anastassios G., Mei Chung, Thomas Trikalinos, Joanna Mitri, Michael Brendel,
Kamal Patel, Alice Lichtenstein, Joseph Lau, and Ethan M. Balk. "Vitamin D and
Cardiometabolic Outcomes: A Systematic Review." Http://www.ncbi.nlm.nih.gov/
pmc/articles/PMC3211092/. Ann Intern Med, 9 Nov. 2011. Web. 14 Nov. 2011.
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-Small, Roy S. "Vitamin D and The Hear." Jlgh.org. Web. .
-Vaysman, Anna M. "Protective Role of Vitamin D on the Cardiovascular System."
U.S. Pharmacist. 2 Sept. 2010. Web.
-"Vitamin D and Health - What Should I Eat? - The Nutrition Source - Harvard
School of Public Health." Harvard School of Public Health - HSPH. Harvard
School of Public Health. Web. 14 Nov. 2011. .
-Wang, Thomas J., Michael J. Pencina, Sarah L. Booth, Paul F. Jacques, Erik Ingelsson,
Katherine Lanier, Emelia J. Benjamin, Ralph B. D'Agostino, Myles Wolf, and
Ramachandran S. Vasan. "Vitamin D Deficiency and Risk of Cardiovascular
Disease." Circulation. National Institutes of Health. Web. 14 Nov. 2011. .

My sources seem to be pretty reliable because the information is mostly founded by Doctors in the field of Cardiology and submit their information to the medical journals.


"Vitamin D Deficiency and Risk of Cardiovascular Disease"
http://circ.ahajournals.org/content/117/4/503.full


"Vitamin D and Health"
http://www.hsph.harvard.edu/nutritionsource/what-should-you-eat/vitamin-d/#vitamin-d-and-heart-disease


"Vitamin D and The Heart"
http://www.jlgh.org/JLGH/media/Journal-LGH-Media-Library/Past%20Issues/Volume%201%20-%20Issue%203/small_-_vitamin_d_and_the_heart.pdf

This is a secondary source considering that he wrote this paper explaining other peoples research.

http://www.hsph.harvard.edu/nutritionsource/what-should-you-eat/vitamin-d/#vitamin-d-and-heart-disease

Now this is a primary source because they themselves have outlined their methods and results and conducted it themselves.

http://circ.ahajournals.org/content/117/4/503.full.pdf+html