Pasaribu NAM. Contribution of Mastery of Sociolinguistic Concepts to Pragmatic Skills by Students of Free Mathodist 1 Private Junior High School Medan 2012/2013 Academic Year. ijobas [Internet]. 2022 Mar. 30 [cited 2026 Aug. 28];10(4):145-53. Available from: https://ijobas.pelnus.ac.id/index.php/ijobas/article/view/70