Sasere, O. B., and S. D. . Makhasane. “School-Based Teacher Professional Development Framework (SBTPDF): A Blueprint for School Principals in Nigeria”. International Journal of Learning, Teaching and Educational Research, vol. 22, no. 8, Aug. 2023, pp. 391-14, http://ijlter.myres.net/index.php/ijlter/article/view/1724.