Wulandari W ., Sibarani B ., Pulungan AH. CULTURE AND INTERLANGUAGE STAGES EFFECT ON EFL STUDENTS™ POLITENESS IN REFUSALS. LT [Internet]. 2021 Sep. 6 [cited 2025 Jul. 6];18(2):166-71. Available from: https://jurnal.unimed.ac.id/2012/index.php/LTBI/article/view/27895