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Sintya Kinanti Putri and Aman Simare-Mare 2026. 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). 5, 9 (Aug. 2026), 5809–5836. DOI:https://doi.org/10.5281/zenodo.22907636.