Martínez Iñiguez JE, López Ramírez E, Ponce Ceballos S. Free textbooks in the context of the New Mexican School. IE Revista de Investigación Educativa de la REDIECH [Internet]. 2024Nov.17 [cited 2025Aug.30];15:e2146. Available from: https://mail.rediech.org/ojs/2017/index.php/ie_rie_rediech/article/view/2146