Marmolejo, Gustavo-Adolfo, and María Teresa González Astudillo. “Visual Control in the Construction of the Area of Two- Dimensional Plane Figures , in Textbooks . An Analysis Methodology”. Revista Latinoamericana de Investigación en Matemática Educativa 18, no. 3 (November 30, 2015): 301–328. Accessed October 23, 2026. https://www.relime.org/index.php/relime/article/view/155.