Gabales, Gerald, et al. “Trackless Train from Valenzuela to Guiguinto, Bulacan: A Proposal Study”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research, vol. 2, no. 1, Apr. 2020, https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/1786.