1.
Siburian TA, Simatupang N, Chairunisa H. Model Development of Principal Performanc Through Empirical Study on Junior High School in Medan Indonesia. IJSBAR. 2017;31(1):248-259. Accessed February 9, 2026. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/6490