Reidolda, C. “Economic Nature of Total National Product and Total Domestic Product in the System of National Accounts”. Economic series of the Bulletin of L.N. Gumilyov ENU, no. 3 (January 25, 2023): 96–104. Accessed January 21, 2026. https://bulecon.enu.kz/index.php/main/article/view/325.