Holmes, L.B., Moser, H.W., Halldorsson, S., Mack, C., Pant, S.S., and Matzilevich, B.: Mental Retardation, An Atlas of Diseases with Associated Physical Abnormalities . New York, The MacMillan Company , 1972. p. 274.
2.
Duke-Elder, S. : System of Opthalmology, Vol. III, Part 2. St. Louis, C. V. Mosby Company, 1963, p. 829. (Best reference)
3.
Smith, D.W.: Recognizable Patterns of Human Malformation, Genetic, Embryologic, and Clinical Aspects, Schaffer, A. J., Con. Ed. Philadelphia, W. B. Saunders Company , 1970, p. 138.
4.
Gorlin, R.J. and Pindborg, J.J.: Syndromes of the Head and Neck. New York, McGraw-Hill Book Company, 1964.
5.
Goodman, R.M. and Gorlin, R.J.: The Face in Genetic Disorders. St. Louis, C. V. Mosby Company, 1970.
6.
Green, M. and Richmond, J.: Pediatric Diagnosis. Philadelphia, W. B. Saunders Company, 1962.
