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, vol. 23, no. 3, Dec. 2025, pp. 309-26, doi:10.63309/dialektika.v23i3.839.