Hidayatulloh, M. David, et al. “A Regression Analysis of Self-Affirmation and Speaking Anxiety on EFL Students’ Oral Performance: A Mixed-Methods Study in an Indonesian Islamic High School”. ELS Journal on Interdisciplinary Studies in Humanities, vol. 8, no. 2, June 2025, pp. 412-24, doi:10.34050/els-jish.v8i2.44441.