Arwin, Arwin, and Said Hamzali. “Effect of Work Productivity on Employee Performance of Pdam Tirta Sejuk (Study In Customer Relationship)”. Eqien - Jurnal Ekonomi dan Bisnis 11, no. 02 (September 30, 2022): 557 – 559. Accessed August 26, 2026. https://www.stiemuttaqien.ac.id/ojs/index.php/OJS/article/view/981.