1. Epidemiology: Principles and Methods;MacMahon,1996
2. International Agency for Research on Cancer. Overall Evaluations of Carcinogenicity: An Updating of IARC Monographs Volumes 1 to 42, Suppl. 7. IARC Monographs for carcinogenic risks to humans. Lyon, IARC, 1987, 440.
3. Tomatis L, ed. Cancer: Causes, Occurrence and Control. IARC Scientific Publications No. 100. Lyon, IARC, 1990.
4. Summary of the evidence;Willett;Cancer Causes and Control,1996
5. Food, Nutrition and the Prevention of Cancer: A Global Perspective,1997