Izadi, Elham, Meshkinfam, Mehrdad. “Analyzing the Evolution of the Level of Politeness inThe Persian-Speaking Community of Iran (1350-1390) Based on the Corpus Analysis.” Pazhūhish-i Źabān va Adabiyyāt-i Farsī, vol. 21, no. 68, 2023, pp. 67-102.