Abd Fatah Dafhi Putra Wendi, Abd. Rasyid Syamsuri, and Prima Andreas. “Employee Productivity in the Palm Oil Industry: The Role of Vertical Communication, Work Discipline, and Intrinsic Motivation”. International Journal of Science and Environment (IJSE) 6, no. 2 (May 15, 2026): 644–653. Accessed May 22, 2026. https://ijsenet.com/index.php/IJSE/article/view/544.