Lina, Mary Fyl C., et al. “Transformational Leadership of School Heads and the Instructional Performance of Public School Teachers: A Convergent Parallel Mixed-Methods Study”. International Journal of Sustainable and Integrated Studies, vol. 1, no. 4, Nov. 2026, pp. 289-95, https://doi.org/10.65339/ijsis.V1.I4.283.