1. Pinker S: Language learnability and language development. 1984, Cambridge, MA: Harvard University Press
2. Neligan GA, Prudham D: Norms for four standard developmental milestones by sex, social class and place in family. Dev Med Child Neurol. 1969, 11: 413-422.
3. Baird G: Assessment and investigation of children with speech and language impairments. Understanding Developmental Language Disorders. Edited by: Norbury CF, Tomblin JB, Bishop DVM. 2008, Hove: Psychology Press
4. Fernell E, Hedvall A, Norrelgen F, Eriksson M, Hoglund-Carlsson L, Barnevik-Olsson M, Svensson L, Holm A, Westerlund J, Gillberg C: Developmental profiles in preschool children with autism spectrum disorders referred for intervention. Res Dev Disabil. 2010, 31: 790-799. 10.1016/j.ridd.2010.02.003.
5. Haynes C, Naidoo S: Children with specific speech and language impairment. 1991, London: MacKeith Press