Utomo, Aries, and Islamiah Bastiar. “The Use of Instagram to Improve English Literature Students’ Self-Confidence in Mastering Speaking Skill”. Jurnal Pendidikan Edutama, vol. 7, no. 2, July 2020, pp. 81-92, http://ejurnal.ikippgribojonegoro.ac.id/index.php/JPE/article/view/980.