Reference
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- Littler T. S., Rice C. G. The value of hearing aids to deaf schoolchildren. Special report. Wernher Research Unit on Deafness. Kings College Hospital Medical School, London. 1964
- Whetnall E. The deaf child, E. Whetnall, D. B. Fry. Heinemann Medical Books. 1964
- W.H.O. Report on a Working Group convened by the Regional Office for Europe of the World Health Organization. The Early Detection and Treatment of Handicapping defects in Young Children. Distributed by Regional Office for Europe, Copenhagen 1967