Batres Rivera, M. R., Gòmez Martìnez, P. C. L., Lòpez Anaya, H. E., Marroquin, S. d., & Rivera Ramìrez, V. H. L. (2016). A study of the effects of the methodology used when carrying out listening activities in intensive basic english, afternoon groups at The Western Multidisciplinary Campus of The University of El Salvador, semester I, 2015. Santa Ana, El Salvador: Universidad de El Salvador.

Batres Rivera, Marvin Renè, Pedro Cèsar Leonel Gòmez Martìnez, Hugo Ernesto Lòpez Anaya, Sonia de Marroquin, and Vìctor Hugo Leonel Rivera Ramìrez. A Study of the Effects of the Methodology Used When Carrying Out Listening Activities in Intensive Basic English, Afternoon Groups At The Western Multidisciplinary Campus of The University of El Salvador, Semester I, 2015. Santa Ana, El Salvador: Universidad de El Salvador, 2016.

Batres Rivera, Marvin Renè, et al. A Study of the Effects of the Methodology Used When Carrying Out Listening Activities in Intensive Basic English, Afternoon Groups At The Western Multidisciplinary Campus of The University of El Salvador, Semester I, 2015. Santa Ana, El Salvador: Universidad de El Salvador, 2016.