MERCADO, Jose Gabriel; 						QUIROS, Edwin.
 Operational Cost Comparison of Alternative Fuel Vehicles for Public Transportation.
<strong>Philippine Engineering Journal</strong>, [S.l.], v. 39, n. 1, june 2018.
ISSN 2718-9287.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/pej/article/view/6209" target="_new">https://www.journals.upd.edu.ph/index.php/pej/article/view/6209</a>&gt;. Date accessed: 01 oct. 2025.