PEJ, pej.
 Editorial Board.
<strong>Philippine Engineering Journal</strong>, [S.l.], v. 40, n. 2, jan. 2020.
ISSN 2718-9287.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/pej/article/view/6999" target="_new">https://www.journals.upd.edu.ph/index.php/pej/article/view/6999</a>&gt;. Date accessed: 30 aug. 2025.