1. Brenton, D. P., Cusworth, D. C, Garrod, P., Krywawych, S., Lachelin, L., Lilburn, M., Smith, I., Thorburn, R., Wolff, O. H. 1981. Maternal phenylketonuria treated by diet before conception. Maternal Phenylketonuria International Workshop directed by H. Bickel, Frankfurt/M, April, 1980. Ed. Maizena Diat Gmbh.
2. Dent, C. E. 1957. Discussion of Armstrong, M.D., Relation of biochemical abnormality to development of mental defect in phenylketonuria in aetiological factors in mental retardation. 23rd Ross Paediatric Research Conference, November 1976, Columbus, Ohio.
3. Fisch, R. O., Walker, W. A. and Anderson, J. A. 1966. Prenatal and postnatal developmental consequences of maternal phenylketonuria. Paediatrics 37, 979–986.
4. Lenke, R. R. and Levy, H. L. 1980. Maternal phenylketonuria and hyperphenylalaninaemia. New Engi. J. Med. 303, 1202–1207.
5. MacCready, R. A., Levy, H. L. 1972. The problems of maternal phenylketonuria. Am. J. Gynaecol. 113, 121–8.