Shwaysh Ahmed, M., Hayif Sameer, I., & Yassein Al-Heeti, M. T. (2019). The Semantic Roles Which Cause Difficulty To The Fourth Year Students Of English At The University Of Anbar. Opción, 35(89), 343-368. Recuperado a partir de https://www.produccioncientificaluz.org/index.php/opcion/article/view/31099