Aslam, S., S. Saleem, and Z. Mahmood. “The Development of a Mental Toughness Scale for Doctors: A Psychometric Study”. Journal of Liaquat University of Medical & Health Sciences, vol. 18, no. 03, Oct. 2019, pp. 214-8, http://121.52.154.205/index.php/jlumhs/article/view/180.