GABRIEL, Erwin.
 Editorial Board 2017.
<strong>Philippine Engineering Journal</strong>, [S.l.], v. 38, n. 2, dec. 2017.
ISSN 2718-9287.
Available at: &lt;<a href="https://journals.upd.edu.ph/index.php/pej/article/view/6003" target="_new">https://journals.upd.edu.ph/index.php/pej/article/view/6003</a>&gt;. Date accessed: 04 aug. 2025.