Utami, Silvya, et al. “Developing Mystery Box in Teaching Narrative Text for Speaking Class at Junior High School”. Jo-ELT (Journal of English Language Teaching) Fakultas Pendidikan Bahasa & Seni Prodi Pendidikan Bahasa Inggris IKIP, vol. 9, no. 2, Dec. 2022, pp. 194-0, doi:10.33394/jo-elt.v9i2.5758.