Nadeak, Vera, Bonari H Tambunan, Rotua Hutasoit, & Juandi Nababan. " THE CORRELATION BETWEEN GRAMMAR MASTERY AND WRITING ABILITY (A CORRELATION STUDY) AT THE TENTH GRADE OF SMK NEGERI 1 SIBORONGBORONG." JURNAL LITTERA: FAKULTAS SASTRA DARMA AGUNG [Online], 1.2 (2021): 175-186. Web. 22 Jul. 2024