Bilal, A. and Aamir, M. 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 (Oct. 2021), 1571–76. DOI:https://doi.org/10.51253/pafmj.v71i5.4332.