Khan, M. I. ., S. U. . Khan, . A. W. Khan, and I. . Qasim. “Critical Barriers in Project Management Faced by Offshore Software Multi-Sourcing Vendors: A Detailed Study: Multi-Sourcing Risks”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 53, no. 3, May 2021, pp. 267-, https://ppaspk.org/index.php/PPAS-A/article/view/285.