1. T. Taylor, Heart, 2016, http://www.innerbody.com/image/card01.html#full-description.
2. Texas Heart Institute, Heart anatomy, Texas Heart Institute, Houston, 2016
3. National Heart Foundation of Australia, The heart foundation, National Heart Foundation of Australia, Sydney, 2009.
4. J. R. Hampton, The ECG Made Easy (International Edition: Churchill Livingstone Elsevier, London, 2013).
5. L. R. Barker, J. R. Burton and P. D. Zieve, Principles of Ambulatory Medicine (Lippinocott, Wilkins and Williams, Philadelphia, 2003).