1. 1. Kliegman et al. Nelson Textbook of Pediatrics. Chap-ter 30th autism spectrum disorder. Philadelphia: ELSEVIER Company, Asian edition, 20th edition 2015, p.176
2. 2. Parthasarathy A. IAP Textbook of Pediatrics, Chapter 6.19, 7th edition, Jaypee Brothers Medical Publisher, New Delhi. 2019, p. 550
3. 3. Huguet G, Ey E, Bourgeron T. The genetic landscapes of autism spectrum disorders. Annu Rev Genomics Hum Genet [Internet]. 2013;14(1):191–213.
4. 4. Fred R. Volkmar, Brian Reichow & James McPart-land (2012) Classification of autism and related con-ditions: progress, challenges, and opportunities, Dia-logues in Clinical Neuroscience, 14:3, 229-237
5. 5. Priyavat Sharma Editor Charak Samhita, Agnivesh, Nidansthana, Chapter 7 verse 5, Chaukhambha Orien-talia, Varanasi, 7th edition,2001, p288