THE EFFECT OF COLLABORATIVE WRITING TECHNIQUE ON STUDENTS WRITING ABILITY AT THE EIGHTH GRADE OF SMP NEGERI 8 PEMATANGSIANTAR. jbl [Internet]. 28 April 2019 [dikutip 1 November 2025];1(1):26-31. Tersedia pada: http://jurnal.usi.ac.id/index.php/jbl/article/view/972