Al Jaber Mortada AM. The Effect of Peer-Mediated Picture Exchange Communication System Intervention in Improving Vocabulary Knowledge in Children with Autism Spectrum Disorders. PERR [Internet]. 2017 Sep. 1 [cited 2025 May 3];6(2):23 – 29. Available from: https://www.perrjournal.com/index.php/perrjournal/article/view/272