Sartika R, Hadijaya Y, Daulay N. Teacher’s Leadership in Implementing Learning to Increase Students Learning Effectiveness During Covid-19 Pandemic. NDH [Internet]. 16Aug.2021 [cited 23Jun.2026];6(2):413-25. Available from: https://e-journal.uac.ac.id/index.php/nidhomulhaq/article/view/1595