Portillo Jiménez, L. D., Portillo Jiménez, L. D., & Portillo Jiménez, L. D. (2011). Diagnosis and academic and socioeconomic evaluation of the first semesters students of the of the Systems Engineering program at CUA. Corporación Universitaria Americana.
Lua i Stíl Chicago (17ú heag.)Portillo Jiménez, Léster Darío, Léster Darío Portillo Jiménez, agus Léster Darío Portillo Jiménez. Diagnosis and Academic and Socioeconomic Evaluation of the First Semesters Students of the of the Systems Engineering Program at CUA. Corporación Universitaria Americana, 2011.
Lua MLA (8ú heag.)Portillo Jiménez, Léster Darío, et al. Diagnosis and Academic and Socioeconomic Evaluation of the First Semesters Students of the of the Systems Engineering Program at CUA. Corporación Universitaria Americana, 2011.