Giraldo, Ricardo, and Javier Vargas. “Academic Performance in the Areas of Mathematics and Natural Sciences in the 8th and 9th Students Enrolled at the Secondary Basic Level”. Impacto Científico 16, no. 2 (December 1, 2021): 435-456. Accessed August 1, 2025. https://produccioncientifica.luz.edu.ve/index.php/impacto/article/view/37303.