Faiza Arshad, Sidra Ansar, Rabia Khalid, Mahrukh Rashid, Fahad Masood, Kanza Sana Umer 2023. Speech Development and Communicative Demands in Autistic Children Using the Picture Exchange Communication System (PECS). Pakistan Journal of Medical & Health Sciences. 16, 12 (Feb. 2023), 596. DOI:https://doi.org/10.53350/pjmhs20221612596.