1. HovellJ. H. (1966) Current Orthodontics. Edited by WaltherD. P. John Wright and Sons Ltd, Bristol.
2. GorlinR. J. and PindborgJ. (1964) Syndromes of the Head and Neck. McGraw Hill Book Company, London.
3. PosseltU. (1962) Physiology of Occlusion and Rehabilitation. Blackwells, Oxford.
4. Walker GreerD. (1961) Malformations of the Face. E. & F. Livingstone Ltd.