Loto P. The Honorific System in German as a Phenomenon of Courtesy: The Culturally Contrastive Analysis of Foreign Language Learning Exemplified through the Use of the Personal Pronouns Du and Sie by Thai German-learners at Chiang Mai University. J. Lett. [internet]. 2018 Dec. 29 [cited 2026 Oct. 13];47(3):339-78. available from: https://so03.tci-thaijo.org/index.php/jletters/article/view/158850