El Sayed Ebrahim, Mona Tawakkul. “Effectiveness of a Pivotal Response Training Programme in Joint Attention and Social Interaction of Kindergarten Children With Autism Spectrum Disorder”. Psycho-Educational Research Reviews 8, no. 2 (August 1, 2019): 48 – 56. Accessed April 27, 2025. https://perrjournal.com/index.php/perrjournal/article/view/159.