Riani, N. “AN ANALYSIS OF THE STUDENTS’ ABILITY IN USING ADVERB OF FREQUENCY IN SIMPLE PRESENT TENSE: A STUDY ON THE FIRST YEAR STUDENTS OF SMA N 7 PADANG IN ACADEMIC YEAR 2009/2010”. NUR EL-ISLAM : Jurnal Pendidikan Dan Sosial Keagamaan, vol. 4, no. 2, Oct. 2017, pp. 166-87, https://ejurnal.iaiyasnibungo.ac.id/index.php/nurelislam/article/view/76.