SANGALANG JR., Leonardo P..
 A Product Mix Optimization Model.
<strong>Philippine Engineering Journal</strong>, [S.l.], v. 3, n. 2, nov. 2021.
ISSN 2718-9287.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/pej/article/view/8357" target="_new">https://www.journals.upd.edu.ph/index.php/pej/article/view/8357</a>&gt;. Date accessed: 26 sep. 2025.