Sumarli S, K.H AS, Widiyati U, Arifin I. Instructional leadership in character education organization at three middle schools in Surabaya, East Java, Indonesia. JSS [Internet]. 2016Oct.1 [cited 2024May7];5(4):580-94. Available from: https://centreofexcellence.net/index.php/JSS/article/view/jss.2016.5.4.580.594