Almeida, Mária Cristina. “The Algebra Textbook for the 3rd Cycle of Liceus (1950): Reflections Based on the Critiques of Its Approval”. Historia y Memoria de la Educación, no. 11 (December 9, 2019): 191–214. Accessed June 28, 2022. https://revistas.uned.es/index.php/HMe/article/view/24169.