Meléndez Linares, Ernesto David and Orantes Zeledón, Daylix Eli and Peña García, Alejandro Ernesto (2019) A correlational study on personal and environmental factors that hinder a native-like english pronunciation of vowel sounds in fourth and fifth-year students at the Western Multidisciplinary Campus of the University of El Salvador, semester II, 2017. Bachelor thesis, Universidad de El Salvador.