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Yosia Rajagukguk, Erika Sinambela, Arsen Nahum Pasaribu. Politeness Strategy and Principles Used in Conversation on Green Book Film . IJERSC [Internet]. 2021Jun.29 [cited 2024Dec.1];2(3):568-73. Available from: https://ijersc.org/index.php/go/article/view/47