Badilla Vargas, G., Quesada Mejías, X., & Rojas Jiménez, E. (2003). A proposal to improve the applicability of the conversational english program, set forth by the Ministerio de Educación Pública and addressed to beginners at night schools. [San Ramón, C.R.].

Badilla Vargas, Gerlanny, Xiomara Quesada Mejías, and Erika Rojas Jiménez. A Proposal to Improve the Applicability of the Conversational English Program, Set Forth By the Ministerio De Educación Pública and Addressed to Beginners At Night Schools. [San Ramón, C.R.], 2003.

Badilla Vargas, Gerlanny, Xiomara Quesada Mejías, and Erika Rojas Jiménez. A Proposal to Improve the Applicability of the Conversational English Program, Set Forth By the Ministerio De Educación Pública and Addressed to Beginners At Night Schools. [San Ramón, C.R.], 2003.