Pamungkas, Niken Ardella Wahyu, et al. “The Effectiveness of Hots-Based Activities Using Harry Potter Novel for Vocabulary Mastery of Idiomatic Expressions ”. Indonesian Journal of Multidisciplinary on Social and Technology, vol. 4, no. 3, Aug. 2026, pp. 4425-33, doi:10.69693/ijmst.v4i3.13232.