Roji F, Basya D, Al - Fauzi F. The Application of Multimedia Based Zello Walkie Talkie in Improving First Grade Students’ Speaking Skill at SMK Kesehatan Medika Farma. EDU [Internet]. 2018May1 [cited 2024Jul.3];6(1):24-30. Available from: https://ejurnal.uij.ac.id/index.php/EDU/article/view/568