sarshar, soheil, rafezi, zohreh, khanjani, mahdi, saei, elham. “The Relationship between Psychological Capital and Emotional labor Due to the Mediating Role of Psychological Hardiness in Khorramabad Hospitals staff.” Knowledge & Research in Applied Psychology, vol. 23, no. 4, 2023, pp. 17-28. 10.30486/jsrp.2020.1906884.2562