Tridinanti, G. (2018). The Correlation between Speaking Anxiety, Self-Confidence, and Speaking Achievement of Undergraduate EFL Students of Private University in Palembang. International Journal of Education and Literacy Studies, 6(4), 35. https://doi.org/10.7575/aiac.ijels.v.6n.4p.35
Banu, R. (2017). Difficulties Faced by College Student in Speaking English – A Sociological Reflection. International Journal of Trend in Research and Development, 4(3), 435–436.
Norman Doidge, MD. (2017). The brain that changes itself Retrieved December 6, 2021, from https://www.normandoidge.com/?page_id=1259.