Likhachyova, L S, and M V Kapkan. “The Transformation of Written Congratulations Etiquette in Early XXIst-Century Russia”. KnE Engineering 3, no. 8 (December 23, 2018): 79–86. Accessed May 12, 2024. https://knepublishing.com/index.php/KnE-Engineering/article/view/3613.