Duc-Harada, Patrycja, Dariusz Głuch, and Senri Sonoyama , eds. “Changes and Modifications Occurring in the Category of Japanese Politeness”. In Japanese Civilization: Tokens and Manifestations. Poland: Księgarnia Akademicka Publishing, 2019. Accessed May 31, 2025. https://books.akademicka.pl/publishing/catalog/book/21/chapter/22.