Iqbal, M. N., A. Ashraf, F.- un-N. Yunus, A. Muhammad, S. Alam, S. Xiao, S. Ali, and M. Irfan. “Prevalence of Angina Pectoris in Relation to Various Risk Factors”. PSM Biological Research, vol. 1, no. 1, May 2016, pp. 6-10, https://psmjournals.org/index.php/biolres/article/view/14.