PICADO ALFARO, M. E.; ESPINOZA GONZÁLEZ, J. The Didactic Suggestions into a Textbook of Arithmetic for Teacher Training in Normal Sections in Costa Rica in the Nineteenth Century. Historia y Memoria de la Educación, [S. l.], n. 11, p. 151–190, 2019. DOI: 10.5944/hme.11.2020.25108. Disponível em: http://revistas.uned.es/index.php/HMe/article/view/25108. Acesso em: 26 jan. 2022.