Cabrera Carrillo, E. E., Corleto Berganza, J. R., Cadenas Marinero, M. B., Lòpez Parada, L. M., & Mojica Villalobos, J. C. (2015). Analysis of the main negative effects of the inexistence of some english consonant and vowel, sounds in spanish on the intensive intermediate english II student's four macro-skills at the Western Multidisciplinary Campus of the University of El Salvador. Santa Ana, El Salvador: Universidad de El Salvador.

Cabrera Carrillo, Emerson Ernesto, José Rigoberto Corleto Berganza, Marcela Beatriz Cadenas Marinero, Luis Mario Lòpez Parada, and Juan Carlos Mojica Villalobos. Analysis of the Main Negative Effects of the Inexistence of Some English Consonant and Vowel, Sounds in Spanish On the Intensive Intermediate English II Student's Four Macro-skills At the Western Multidisciplinary Campus of the University of El Salvador. Santa Ana, El Salvador: Universidad de El Salvador, 2015.

Cabrera Carrillo, Emerson Ernesto, et al. Analysis of the Main Negative Effects of the Inexistence of Some English Consonant and Vowel, Sounds in Spanish On the Intensive Intermediate English II Student's Four Macro-skills At the Western Multidisciplinary Campus of the University of El Salvador. Santa Ana, El Salvador: Universidad de El Salvador, 2015.