Effectiveness of PECS Phase III in Enhancing Requesting Behaviour among Young Children with Nonverbal Autism: A Comparative Classroom-Based Study in Qatar and Nigeria. Journal of Education, Communication, and Digital Humanities [Internet]. 2026 Aug. 1 [cited 2026 Aug. 7];4(2):734-51. Available from: https://aa.unij.co.uk/index.php/jecdh/article/view/77