Mardin Silalahi and Nelma Hartati Simamora 2019. THE EFFECT OF COLLABORATIVE WRITING TECHNIQUE ON STUDENTS WRITING ABILITY AT THE EIGHTH GRADE OF SMP NEGERI 8 PEMATANGSIANTAR. Bilingual : Jurnal Pendidikan Bahasa Inggris. 1, 2 (Oct. 2019), 26–31. DOI:https://doi.org/10.36985/jbl.v1i1.240.