Marpaung, M.S. 2019. The Correlation between Self-Confidence and Students’ English Achievement of Tertiary Students at Universitas Advent Indonesia. Acuity: Journal of English Language Pedagogy, Literature and Culture. 3, 2 (Aug. 2019), 98-110. DOI:https://doi.org/10.35974/acuity.v3i2.648.