El Sayed Ebrahim MT. Effectiveness of a Pivotal Response Training Programme in Joint Attention and Social Interaction of Kindergarten Children with Autism Spectrum Disorder. PERR [Internet]. 2019 Aug. 1 [cited 2025 Apr. 27];8(2):48 – 56. Available from: https://perrjournal.com/index.php/perrjournal/article/view/159