Ulpa, A., D. I. Asiati, and M. Nurrahmi. “The Effect of Leadership and Training on Employee Performance through Competency at PT Pertamina Drilling Services Project Sumatera Bagian Selatanroject Sumatera Bagian Selatan”. International Journal of Marketing & Human Resource Research, vol. 5, no. 2, Apr. 2024, pp. 62 -82, doi:10.47747/ijmhrr.v5i2.1728.