Al Jaber Mortada, Abla Mohammed. “The Effect of Peer-Mediated Picture Exchange Communication System Intervention in Improving Vocabulary Knowledge in Children With Autism Spectrum Disorders”. Psycho-Educational Research Reviews 6, no. 2 (September 1, 2017): 23 –. Accessed May 19, 2024. https://perrjournal.com/index.php/perrjournal/article/view/272.