Alfraidi, Y., S. M. Alzahrani, M. H. H. Abdelhafez, and H. Boussabaine. “Impact of Endogenous Risk Factors on Risk Cost in PPP Projects in Saudi Arabia”. Engineering, Technology & Applied Science Research, vol. 10, no. 4, Aug. 2020, pp. 6087-91, doi:10.48084/etasr.3462.