Purnama, C., D. Fatmah, S. Hasani, and M. Rahmah. “Leadership style as moderating variable influence between Islamic work ethic with performance”. Kasetsart Journal of Social Sciences, vol. 42, no. 2, Apr. 2021, pp. 233-8, https://so04.tci-thaijo.org/index.php/kjss/article/view/250886.