Salih Hussein F, Salih Fayyadh M. The Effect of the Penteresh and Raguloth Models on the Acquisition of Linguistic Concepts among the Second Intermediate Students and Developing Their Systemic Thinking. Opción [Internet]. 13 de agosto de 2019 [citado 26 de septiembre de 2025];350:1121-48. Disponible en: http://www.produccioncientifica.luz.edu.ve/index.php/opcion/article/view/27604