Indriani, S., R. Listia, E. Arapah, and F. Mu’in. “THE POLITENESS STRATEGIES IN LECTURERS’ ILLOCUTIONS IN TEACHING ENGLISH FOR NON-ENGLISH DEPARTMENT STUDENTS”. LINGUA EDUCATIA, Vol. 1, no. 1, Sept. 2019, pp. 62-72, https://jtam.ulm.ac.id/index.php/gej/article/view/272.