Sengke, Karen Irene, et al. “Analysis of the Effect of Work Overload, Work Motivation, and Training of Employees in the Implementing Competency Pathway on Employee Work Productivity at PT PLN (Persero) UP3 Palu”. EUROPEAN JOURNAL OF BUSINESS STARTUPS AND OPEN SOCIETY, vol. 3, no. 4, Apr. 2023, pp. 20-33, http://inovatus.es/index.php/ejbsos/article/view/1585.