Nadeak, V., 		Tambunan, B., 		Hutasoit, R., & 		Nababan, J.
2021 Oct 27.  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