1. Gustayson KH 1996. Epidemiological,genetic and preventive aspects of mental retardation, origin and prevention. In: JR Singh (Ed.) Current Concepts in Human Genetics. Amritsar: GND University Press, pp. 232–241.
2. Kaur R, Gandhi G, Singh JR 1996. Cytogenetic Studies in Referred Cases-An Indian Experience In: JR Singh (Ed.) Current Concepts in Human Genetics. Amritsar: GND University Press, pp. 97–101.
3. Mueller RF, Young ID 1998. Emery’s “Elements of Medical Genetics”. Hong Kong: Churchill Livingstone, pp. 246-247.