Qayyum, S., S. Khan, and F. Younas. “Evaluating Mediation and Moderation Effects in Call Center Employees: A Correlational Investigation into Fatigue, General Health, Coping and Sleep Disturbances”. Journal of Public Value and Administrative Insight, vol. 5, no. 2, June 2022, pp. 220-44, doi:10.31580/jpvai.v5i2.2506.