Nasriah, N., S. Milfayetty, and H. Sitompul. “The Influence of Organizational Culture and Personal Ability Toward the Performances of the Kindergarten Principals in Medan City”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 32, no. 2, Mar. 2017, pp. 1-10, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/6895.