Contento Minga, Norma Elizabeth, and Floralba del Rocío Aguilar Gordón. “Metodology Strategy for the Development of Preoperational Thinking in the Teaching of Oral and Written Comprehension and Expression in Pre-School Children”. SAPERES UNIVERSITAS, vol. 8, no. 1, Jan. 2025, pp. 27-58, https://publishing.fgu-edu.com/ojs/index.php/RSU/article/view/560.