Using of the Politeness Principle in Dissertation Writing: Focus on the English Department of the Teacher Training College of Mbujimayi. int.jour.sci.res.mana [Internet]. 2023 Sep. 12 [cited 2024 May 19];11(09):2866-7. Available from: https://ijsrm.net/index.php/ijsrm/article/view/4684