Guzman, Ruth Marian, Ricardo Noel R. Gervasio, Ian Kendrich C. Fontanilla, & Ernelea P. Cao.
" Frequency Distribution of Blood Groups ABO, MN and Rh Factor in Philippine Cosmopolitan, Regional and the National Populations." <em>Science Diliman: A Journal of Pure and Applied Sciences</em> [Online], 21.2 (2009): n. pag. Web. 30 Sep. 2025