Mora Flores, Walter. “Calculus in Several Variables. Interactive Visualization (Wolfram CDPlayer) 2nd Ed.: Cálculo En Varias Variables. Visualización Interactiva”. Mathematics, Education and Internet Journal 19, no. 2 (April 2, 2019). Accessed May 2, 2024. https://revistas.tec.ac.cr/index.php/matematica/article/view/4221.