N. C. Villamin, “School Heads’ Competencies in the Lens of VUCA: Basis for Strategic Management Plan”, IJRESM, vol. 8, no. 9, pp. 60–69, Sep. 2025, Accessed: Feb. 10, 2026. [Online]. Available: https://journal.ijresm.com/index.php/ijresm/article/view/3355