Dea Aprillia Simamora, Barham Siregar, and Nurul Dalimunte. “Employee Training Efforts and Incentive Provision Towards Improving Employee Performance Through Customer Service at Kembar Ponsel Medan”. Jurnal Dialektika: Jurnal Ilmu Sosial 23, no. 3 (December 18, 2025): 309–326. Accessed April 16, 2026. https://jurnaldialektika.com/index.php/piani/article/view/839.