VILLEGAS, Edberto M..
The Modern Principalia: The Historical Evolution of the Philippine Ruling Oligarchy by Dante C. Simbulan.
Philippine Political Science Journal, [S.l.], v. 30, n. 53, july 2009.
ISSN 0115-4451. Available at: <https://journals.upd.edu.ph/index.php/ppsj/article/view/1340>. Date accessed: 05 aug. 2025.