Ali Alshehhi, Hamad, et al. “Mediating Effect of External Factors to the Relationship Between Leadership Styles and Organizational Performance ”. International Journal of Sustainable Construction Engineering and Technology, vol. 14, no. 2, May 2023, pp. 7-22, https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/13456.