Siregar, Haposan, Indrayani Indrayani, Muammar Khaddafi, Yanita Yanita, and Henny Irawati. “THE INFLUENCE OF MOTIVATION AND LEADERSHIP STYLE ON EMPLOYEE PERFORMANCE AT THE ENVIRONMENT AND FORESTRY SERVICE OF RIAU ISLANDS PROVINCE”. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) 1, no. 3 (February 27, 2022): 133–144. Accessed July 1, 2025. http://ijset.org/index.php/ijset/article/view/15.