Oladi, M., Manzari Tavakoli, H., Sayadi, S., Selajgeh, S., & Sheikhi, A. "Investigating the personality traits of employees and its relationship with optimal performance" .e15717 , Medical Journal of Mashhad university of Medical Sciences, 61, supplment1, 2019, e15717. doi: 10.22038/mjms.2019.15717