VILLORIA JR., Olegario G..
 Research Brief:  I.E./O.R. Research and Development Opportunities in Distribution and Transportation.
<strong>Philippine Engineering Journal</strong>, [S.l.], v. 15, n. 1, sep. 2021.
ISSN 2718-9287.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/pej/article/view/8080" target="_new">https://www.journals.upd.edu.ph/index.php/pej/article/view/8080</a>&gt;. Date accessed: 16 sep. 2025.