Ulfa, U., Wiyaka, W. and Wahyuni, S. 2023. Improving Student’s Vocabulary Mastery Through Hello English Application at Tenth-Grade Students of High School. Lingua Franca. 2, 2 (Aug. 2023), 12–26. DOI:https://doi.org/10.37680/lingua_franca.v2i2.2465.