Ibnus, Nizar, and Yan Mujiyanto. 2018. “The Comparison of Politeness Components Between New Headway Intermediate Student’s Book and Bahasa Inggris SMA/MA/SMK/MAK Kelas X”. English Education Journal 8 (1), 76-86. https://doi.org/10.15294/eej.v8i1.22157.