Cherutoi, P. C., A. Okutu, and S. Chumba. “Contribution of principals’ Instructional Leadership on learners’ Academic Achievement in Public Secondary Schools in Baringo County, Kenya”. Journal of Research Innovation and Implications in Education, vol. 8, no. 3, May 2025, pp. 111-, https://www.ajol.info/index.php/jriie/article/view/294668.