Chávez Luna, A. C., Serrano Sánchez, V. A., Vaquerano Cañada, W. E., Oliva, J. I., & Sibrián, R. A. (2008). Idiomatic use in the speech of students who have finished the advanced intensive english courses in the Foreign Language Departament. San Salvador: Universidad de El Salvador.

Chávez Luna, Ana Cecilia, Verónica Argelia Serrano Sánchez, William Ernesto Vaquerano Cañada, José Israel Oliva, and Rodolfo Alexander Sibrián. Idiomatic Use in the Speech of Students Who Have Finished the Advanced Intensive English Courses in the Foreign Language Departament. San Salvador: Universidad de El Salvador, 2008.

Chávez Luna, Ana Cecilia, et al. Idiomatic Use in the Speech of Students Who Have Finished the Advanced Intensive English Courses in the Foreign Language Departament. San Salvador: Universidad de El Salvador, 2008.