Sihombing, S., A. Setiawati, R. Sitanggang, and A. A. Thabah. “The Cost and Benefits of Employee Training: Analyzing ROI in Human Resources”. Atestasi : Jurnal Ilmiah Akuntansi, vol. 7, no. 2, June 2024, pp. 781-94, doi:10.57178/atestasi.v7i2.881.