Levchenko, Liudmyla. “Organizational-Pedagogical Conditions of Professional Self-Perfection of the Head of General Educational Institution”. Pedagogical Discourse0, no. 18 (April 23, 2015): 123-127. Accessed November 22, 2024. http://ojs.kgpa.km.ua/index.php/peddiscourse/article/view/267.