Sintya Kinanti Putri, Aman Simare-Mare. THE ROLE OF PRINCIPAL LEADERSHIP IN IMPROVING LEARNING EFFECTIVENESS IN KINDERGARTEN IN TANJUNG MORAWA DISTRICT. IJSET [Internet]. 2026 Aug. 10 [cited 2026 Aug. 11];5(9):5809-36. Available from: https://ijset.org/index.php/ijset/article/view/2183