B. P. Lutfidha and B. Haryanto, “Innovation Of Adaptive Principal Leadership Based On Fiedler Contingency Model: Inovasi Kepemimpinan Adaptif Kepala Sekolah Berdasarkan Model Kontingensi Fiedler”, ijins, vol. 27, no. 3, p. 10.21070/ijins.v27i3.2156, Aug. 2026.