Parlinda, Parlinda, and Hasan Ubaidillah. “Training, Motivation, and Environment: Boosting Contractor Work Productivity”. Academia Open 8, no. 1 (June 26, 2023): 10.21070/acopen.8.2023.3964. Accessed March 28, 2024. https://acopen.umsida.ac.id/index.php/acopen/article/view/3964.