DAMIAN, Johnson.
 Preparing a Historical GIS for the Mass Transit Systems of Metro Manila from the Nineteenth Century to the Present.
<strong>Kasarinlan: Philippine Journal of Third World Studies</strong>, [S.l.], p. 235-258, july 2017.
ISSN 2012-080X.
Available at: &lt;<a href="https://www.journals.upd.edu.ph/index.php/kasarinlan/article/view/5709" target="_new">https://www.journals.upd.edu.ph/index.php/kasarinlan/article/view/5709</a>&gt;. Date accessed: 03 aug. 2025.