Sumarli, S., K.H, A. S., Widiyati, U. and Arifin, I. (2016) “Instructional leadership in character education organization at three middle schools in Surabaya, East Java, Indonesia”, Journal of Social Sciences (COES&RJ-JSS), 5(4), pp. 580–594. doi: 10.25255/jss.2016.5.4.580.594.