Maher Jalil W. The Effectiveness of the controversial experimental approach in chemistry achievement and the nature of scientific knowledge for fifth scientific grade students. Opción [Internet]. 13 de agosto de 2019 [citado 2 de agosto de 2025];350:1247-82. Disponible en: http://www.produccioncientifica.luz.edu.ve/index.php/opcion/article/view/31461