Mardin Silalahi, Nelma Hartati Simamora. THE EFFECT OF COLLABORATIVE WRITING TECHNIQUE ON STUDENTS WRITING ABILITY AT THE EIGHTH GRADE OF SMP NEGERI 8 PEMATANGSIANTAR. JBL [Internet]. 2019 Oct. 14 [cited 2024 Jul. 22];1(2):26-31. Available from: https://jurnal.usi.ac.id/index.php/bilingual/article/view/240