Salih Hussein, F., & Salih Fayyadh, M. (2019). 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, 35, 1121-1148. Recuperado a partir de https://produccioncientificaluz.org/index.php/opcion/article/view/27604