Razakova, A.A., M.A. Yelpanova, and Shoshanov S.В. “The Efficiency of Outsourcing and the Issues of Its USE in the Activities of Oil and Gas Companies”. ECONOMIC Series of the Bulletin of the L N Gumilyov ENU, no. 3 (January 25, 2023): 37–45. Accessed May 4, 2024. https://bulecon.enu.kz/index.php/main/article/view/318.