M. Sofyan Hasan Lubis, Yohny Anwar, Muhammad Isa Indrawan. Employee Performance Improvement at PT Cahaya Abadi Terang Medan Is Based on the Work Environment, Work Motivation, and Work Discipline. siasat [Internet]. 2022Oct.12 [cited 2025Oct.13];7(4):261-70. Available from: https://siasatjournal.id/index.php/siasat/article/view/130