Sintya Kinanti Putri, and Aman Simare-Mare. “THE ROLE OF PRINCIPAL LEADERSHIP IN IMPROVING LEARNING EFFECTIVENESS IN KINDERGARTEN IN TANJUNG MORAWA DISTRICT”. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET), vol. 5, no. 9, Aug. 2026, pp. 5809-36, https://ijset.org/index.php/ijset/article/view/2183.