References
- Conrad, R. (1976) Towards a Definition of Oral Success. Paper presented at a meeting on Methods of Communication in the Education of Deaf Children. Harrogate: The Royal National Institute for the Deaf,
- Denmark, J. C. (1973) The Education of Deaf Children. Hearing 28 (9), 284–293.
- Denmark, J. C. (1975) Early Profound Deafness and Mental Retardation. Unpublished M.Psy.Med. Thesis. University of Liverpool.
- Gorman, P. and Paget, G. (1970) A Systematic Sign Language. Association for Experiment in Oral Education. London.
- Gregory, S. (1976) The Deaf Child and his Family. Allen and Unwin Ltd. London.
- Penrose, L. S. (1949) "The Biology of Mental Defect" Sedgeworth and Jackson. London.