Handayani, S., I. Q. Hidayat, W. . Pambudi, and M. Lase. “Data Processing Android Applications EFU English Course”. Jurnal Mantik, vol. 5, no. 2, Aug. 2021, pp. 1045-5, doi:10.35335/jurnalmantik.Vol5.2021.1457.pp1041-1051.