Bolotnikova, Alla, Nadiya Balandina, . ., and . . “Vocative As a Marker of Politeness Category Expression”. International Journal of Engineering & Technology 7, no. 4.8 (October 13, 2018): 759–764. Accessed May 1, 2024. https://sciencepubco.com/index.php/ijet/article/view/27455.