“The Theory of Step-By-Step Teаching of Foreign Lаnguаges Аccording to Аge”. American Journal of Public Diplomacy and International Studies (2993-2157) 1, no. 3 (May 10, 2023): 1–5. Accessed January 27, 2026. https://www.grnjournal.us.e-scholar.org/index.php/AJPDIS/article/view/166.