El Sayed Ebrahim, M. T. . “Effectiveness of a Pivotal Response Training Programme in Joint Attention and Social Interaction of Kindergarten Children With Autism Spectrum Disorder”. Psycho-Educational Research Reviews, vol. 8, no. 2, Aug. 2019, pp. 48 -, https://perrjournal.com/index.php/perrjournal/article/view/159.