Devie, D., Hatane Semuel, and Hotlan Siagian. “The Different Impact Between Transformational Leadership and Transactional Leadership on Competitive Advantage”. Journal of Progressive Research in Social Sciences 3, no. 1 (November 26, 2015): 146-153. Accessed November 24, 2024. http://scitecresearch.com/journals/index.php/jprss/article/view/326.