C. Espartero and M. . Bautista, “School Heads’ Supervisory Skills, Leadership Practices and Teachers’ Morale”, Int. Multidiscip. J. Res. Innov. Sustain. Excell. , vol. 2, no. 6, pp. 185–197, Jun. 2025, doi: 10.5281/zenodo.15631085.