GUZMAN, Ruth Marian S. et al.
 Frequency Distribution of Blood Groups ABO, MN and Rh Factor in Philippine Cosmopolitan, Regional and the National Populations.
<strong>Science Diliman: A Journal of Pure and Applied Sciences</strong>, [S.l.], v. 21, n. 2, sep. 2010.
ISSN 2012-0818.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/sciencediliman/article/view/1964" target="_new">https://www.journals.upd.edu.ph/index.php/sciencediliman/article/view/1964</a>&gt;. Date accessed: 30 sep. 2025.