Azar, A., & Momeni, M. (2016). Statistics and its application in management (statistical analysis) (Twentieth ed.). Tehran: SAMT.

Chapman, C., & Ward, S. (1999). Project Risk Management Process, Techniques & Insights. John Wiley.

Fakhratov, M., Chulkov, V., Kuzhin, M., Akbari, M. (2020). Risk Management implementation and presenting the applicable methodology for its implementation in construction projects. E3S Web of Conferences. EDP Sciences 2020. doi:10.1051

Forcael, E., Morales, H., Agdas, D., Rodriguez, C. (2018). Risk Identification in the Chilean Tunneling Engineering Management Journal, pp. 203-215. doi:10.1080/10429247.2018.1484266

Hillson, D., & Simon, P. (2012). Practical Project Risk Management (2nd ed.).

khaki, G. (2017). Research method with dissertation approach (6th ed.). tehran: Fouzhan.

Morris, S. M., & Gopalakrishna, B. (2020). Development of a Risk Management Framework for Tunnel Construction in India. International Journal of Engineering Research & Technology (IJERT), 9(06), 1368-1374. doi:10.17577/IJERTV9IS060958

Nikjoo, M., & Norang, A. (2011). Comprehensive risk management program of Mashhad city train line 2 with a knowledge-based approach. Sixth International Project Management Conference. tehran: Ariana Industrial Research Group.

PMBOK Guide (5th ed.). (2013). Newtown Square, PA, USA: Project Management Institute.

PMI. (2012). Pulse of the Profession: Driving success in challenging Times. PMI.

Project Risk Analysis and Management Guide. (2004). APM Publishing.

Shahraki, M. R., & Parsaye Mohebbi, S. J. (2015). Presenting a methodology based on the Delphi method for identifying risk management factors in. Mashhad : Seventh National Conference on Urban Planning and Management.

Shams Majd, R., & Mortaheb, M. (2008, February). Presenting a method for risk evaluation and management in EPC contracts. Project Management Quarterly, pp. 2-13.

Sihombing, O., Purba, H., Purba, A. (2020). Risk Identification In Tunnel Construction Project. Architecture and Civil Engineering, pp. 261-286. Retrieved from https://doi.org/10.2298/FUACE200704019M

Xu, Wei.,  Liu, Bo.,  Fu , Chunqing.,  Han,  Yanhui.,   Ren, Xin. (2019). Risk Management for Beijing Subway Tunnel Construction Using the New Austrian Tunneling Method:. International Conference on Transportation and Development, (pp. pp 423-435). Alexandria Virginia, United State. Retrieved from https://doi.org/10.1061/9780784482575.040

Zare pour, E. (2015). Golden Techniques in Article Writing. Tehran: Kasra Book Publishing.

Zou, P. X., & Li, J. (2010, December). Risk identification and assessment in subway projects:case study of Nanjing Subway Line 2. Construction Management and Economics, pp. 1219-1238. doi:10.1080/01446193.2010.519781.