Putri, Ekawati, Dody Wahyudi Purnama, and Ida Maulida. 2020. “THE INFLUENCE OF SUBSTITUTION DRILLS TOWARD STUDENTS’ SIMPLE PRESENT TENSE MASTERY”. Prosiding Seminar Nasional Pendidikan Universitas Subang (SENDINUSA) 1 (1):169-73. http://ejournal.unsub.ac.id/index.php/sendinusa/article/view/660.