Verma, R., B. K. Guha, and S. K. Shrivastava. “Anatomical Study of the Variations of Sinuatrial and Atrioventricular Nodal Arteries in Human Heart”. International Journal of Medical Research and Review, Vol. 2, no. 3, June 2014, pp. 209- 214, doi:10.17511/ijmrr.2014.i03.10.