Acosta Marenco, E. F., Seballos Mejía, J. J., Huang, Y., & Garay Salinas, R. (2011). Factors that interfere in the accomplishment of an advanced-mid level of oral proficiency by the graduation process students term I-2010 of the Licenciatura en Idioma Inglés opción enseñanza at the foreign languages Department of the University of El Salvador. San Salvador: Universidad de El Salvador.

Acosta Marenco, Erika Flavia, Javier José Seballos Mejía, Yu-Teng Huang, and Ricardo Garay Salinas. Factors That Interfere in the Accomplishment of an Advanced-mid Level of Oral Proficiency By the Graduation Process Students Term I-2010 of the Licenciatura En Idioma Inglés Opción Enseñanza At the Foreign Languages Department of the University of El Salvador. San Salvador: Universidad de El Salvador, 2011.

Acosta Marenco, Erika Flavia, Javier José Seballos Mejía, Yu-Teng Huang, and Ricardo Garay Salinas. Factors That Interfere in the Accomplishment of an Advanced-mid Level of Oral Proficiency By the Graduation Process Students Term I-2010 of the Licenciatura En Idioma Inglés Opción Enseñanza At the Foreign Languages Department of the University of El Salvador. San Salvador: Universidad de El Salvador, 2011.