Doñan Alas, J. I., García Larios, J. E., Sánchez Ruiz, Z. A. M., Landaverde, M. A., & Garay Salins, R. (2011). How paid employment influences the academic performance of students at the Foreign Language Departament of the School of Arts and Sciences at University of El Salvador and how it differs from their non-working peers. San Salvador, El Salvador: [publicador no identificado].

Doñan Alas, José Iván, Jennifer Elizabeth García Larios, Zoryxa Ana María Sánchez Ruiz, Manuel Alexander Landaverde, and Ricardo Garay Salins. How Paid Employment Influences the Academic Performance of Students At the Foreign Language Departament of the School of Arts and Sciences At University of El Salvador and How It Differs From Their Non-working Peers. San Salvador, El Salvador: [publicador no identificado], 2011.

Doñan Alas, José Iván, et al. How Paid Employment Influences the Academic Performance of Students At the Foreign Language Departament of the School of Arts and Sciences At University of El Salvador and How It Differs From Their Non-working Peers. San Salvador, El Salvador: [publicador no identificado], 2011.