1. Test for Auditory Comprehension of Language;Carrow,1973
2. The Measurement of Intelligence of Infants and Young Children;Cattell,1960
3. Prognosis in autism: a follow-up study;DeMyer;J. Aut. Childh. Schizo.,1973
4. Peabody Picture Vocabulary Test;Dunn,1981
5. The syndrome of autism: a critical review of diagnostic systems and follow-up studies and the theoretical background of the Behavior Observation Scale;Freeman,1982