ROXAS, JR., Nicanor R.; FILLONE, Alexis M.. Income Effect in Inter-Island Passenger Mode Choice for the Western Visayas Region, Philippines. Philippine Engineering Journal, [S.l.], v. 35, n. 2, aug. 2021. ISSN 2718-9287. Available at: <https://www.journals.upd.edu.ph/index.php/pej/article/view/7889>. Date accessed: 20 sep. 2025.