Mokhlis, S. “Kepimpinan Guru Besar Dalam Pelaksanaan Pendidikan Abad Ke-21: Satu Kajian Preliminari: Headmasters’ Leadership in the Implementation of 21st Century Education: A Preliminary Study”. ATTARBAWIY: Malaysian Online Journal of Education, vol. 3, no. 2, Dec. 2019, pp. 11-21, doi:10.53840/attarbawiy.v3i2.30.