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. OpciĆ³n, 35, 1121-1148. Recuperado a partir de https://produccioncientificaluz.org/index.php/opcion/article/view/27604