Mohd Azli, A. M., and M. Bahari. “Prevalence of Anti A and Anti B Titer Among Blood Group O Donors”. Healthscope: The Official Research Book of Faculty of Health Sciences, UiTM, vol. 4, no. 1, Oct. 2021, pp. 94-98, http://healthscopefsk.com/index.php/research/article/view/221.