Klynina, Tetiana. “Place of the United States Secretary of States in the Power System and Formation of the Country External Course (XX - at the Beginning of XXI century): Historical Backgraund”. Skhid, no. 2(166) (May 1, 2020): 29–34. Accessed July 18, 2024. https://skhid.kubg.edu.ua/article/view/201477.