Ambarita, Biner, Paningkat Siburian, and Sukarman Purba. 2014. “Development of Academic Supervision Model Which Based on Educational Management”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 18 (1):304-14. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/2891.