Arwin, Arwin, and Said Hamzali. 2022. “EFFECT OF WORK PRODUCTIVITY ON EMPLOYEE PERFORMANCE OF PDAM TIRTA SEJUK (STUDY IN CUSTOMER RELATIONSHIP)”. Eqien - Jurnal Ekonomi Dan Bisnis 11 (02):557 – 559. https://doi.org/10.34308/eqien.v11i02.981.