Sari, F. F. K., and S. Marmoah. “Analysis of Leadership Behavior Differences from Principles of Elementary School in Serangoon (Singapore) and Salatiga (Indonesia)”. Kelola: Jurnal Manajemen Pendidikan, vol. 9, no. 1, June 2022, pp. 37-42, doi:10.24246/j.jk.2022.v9.i1.p37-42.