1. A new visual chart for pre-school developmental screening;Barber, J.H.; Boothman, R.; Stanfield, J.P.;Health Bulletin,1976
2. Ellis, R. W. B., and Mitchell, R. G. (1973). Disease in Infancy and Childhood, seventh edition. Edited by R. G. Mitchell. Churchill Livingstone: Edinburgh.
3. The ascertainment of deafness in infancy and childhood;Ewing, I.R.; Ewing, A.W.G.;Journal of Laryngology and Otology,1944
4. Textbook ofPaediatrics;Forfar, J.O.; Arneil, G.,1973
5. Infancy and childhood;Holt, K.S.;Lancet,1974