Tularsih, Sri, et al. “Principal Instructional Leadership and the Development of a Positive Learning Ecosystem: A Qualitative Case Study in an Indonesian Primary School”. QALAMUNA: Jurnal Pendidikan, Sosial, Dan Agama, vol. 18, no. 2, Oct. 2026, pp. 1351-66, doi:10.37680/qalamuna.v18i2.10644.