Abdul Wahab, J., A. Zamri Mansor, M. Hussin, and S. Kumarasamy. “Headmasters’ Instructional Leadership and Its Relationship With Teachers Performance ”. Religación, Vol. 4, no. 21, Nov. 2019, pp. 202-6, https://revista.religacion.com/index.php/religacion/article/view/531.