R. Vicera, C., and E. G. Maico. “Impact of School Heads Management Styles on the Teacher’s Instructional Competence and School Performance”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 45, no. 1, Mar. 2019, pp. 64-74, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9844.