Amaliarrafiun, P. N., Hastini, Maf’ulah, M., & Zarkiani. (2026). Investigating EFL Students’ Difficulties in Producing English Interdental Fricatives (/Θ/ and /Ð/): A Descriptive Quantitative Study. FOSTER: Journal of English Language Teaching, 7(2), 547-561. https://doi.org/10.24256/foster-jelt.v7i2.412