1. ACGIH (1968): “Threshold Limit Values of Airborne Contaminants for 1968—Recommended and Intended Values.” American Conference of Governmental Industrial Hygienists. St. Louis, MO.
2. , , . (1984): Part II. Socio-economic conditions of workers in glass bangle industry at Firozabad. p. 73. ITRC Publication, Lucknow, India.
3. (1983): “Statistical Methods in Medical Research.” London: Blackwell Scientific Publications, pp 384–388.
4. . (1979): Smoking—Evaluation of studies which have demonstrated pulmonary function changes. In (eds): “The Lung in Transition Between Health and Disease.” Vol 12. New York: Marcel Dekker.