Alahdal A, Hassan Al-Ahdal AAM. Effectiveness of Collaborative Learning as a Strategy in the Teaching of EFL. Opción [Internet]. 3 de agosto de 2019 [citado 2 de agosto de 2025];350:1026-43. Disponible en: http://www.produccioncientifica.luz.edu.ve/index.php/opcion/article/view/24566