Bilal, Ahmad, and Minahil Aamir. 2021. “THREAT OF COVID-19 AND PERCEIVED STRESS: THE MEDIATING ROLE OF CHALLENGE, UNCONTROLLABILITY AND STRESSFULNESS: Threat of COVID-19 And Perceived Stress”. Pakistan Armed Forces Medical Journal 71 (5): 1571-76. https://doi.org/10.51253/pafmj.v71i5.4332.