Effect Of PECS (Picture Exchange Communication System) In Developing Tamil Vocabulary Among Children With Autism. International Journal of Food and Nutritional Sciences, [S. l.], v. 11, n. 7, p. 816–821, 2022. Disponível em: https://www.ijfans.org/index.php/Journal/article/view/6682. Acesso em: 14 aug. 2026.