A System of Exercises for the Development of Oral Expression in Eleventh Graders at Julio Antonio Mella Senior High School in Manzanillo (Original). REDEL [Internet]. 2021 Nov. 13 [cited 2025 Jan. 11];5(4):273-8. Available from: https://revistas.udg.co.cu/index.php/redel/article/view/2861