Dewi, Fitri Ulya, et al. “94. The Implementation of Vocabulary Mastery by Using Cambridge Online Dictionary to Enhance Students’ Speaking Skill in Hortatory Exposition Text”. Prosiding Seminar Nasional Pendidikan Profesi Guru, vol. 1, no. 1, July 2023, pp. 860-7, https://conference.upgris.ac.id/index.php/psnppg/article/view/4032.