Fathoni, Irzal, and Maya Novita Sari. “The Effects of Education Level, Work Environment, and Work Motivation on Employee Productivity”. Research Horizon 6, no. 3 (June 25, 2026): 1427–1438. Accessed August 25, 2026. http://www.journal.lifescifi.com/index.php/RH/article/view/1379.