Higuera-Martinez, O. I. (2017). Student dropout in Colombia and the engineering programs of the Uptc campus Sogamoso. Universidad Pedagógica y Tecnológica de Colombia - UPTC.
Lua i Stíl Chicago (17ú heag.)Higuera-Martinez, Oscar Ivan. Student Dropout in Colombia and the Engineering Programs of the Uptc Campus Sogamoso. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2017.
Lua MLA (9ú heag.)Higuera-Martinez, Oscar Ivan. Student Dropout in Colombia and the Engineering Programs of the Uptc Campus Sogamoso. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
