Naibaho, Togar, Syah Paradiba Sari Sirait, and Winfrontstein Naibaho. “The Influence of Work Motivation and Work Environment on Employee Productivity at Sapadia Pematangsiantar”. Journal of Economics and Social Sciences (JESS) 5, no. 1 (June 30, 2026): 649–655. Accessed July 6, 2026. https://journal.civiliza.org/index.php/jess/article/view/1716.