Rezeki, F., H. Muhammad Mardiputera, and A. Wulandari. “High and Low Levels of Employee Performance: The Role of Transformational Leadership Styles and Employee Engagement”. Asian Journal of Management, Entrepreneurship and Social Science, Vol. 3, no. 03, July 2023, pp. 568-84, https://mail.ajmesc.com/index.php/ajmesc/article/view/454.