Gerson, M., 1958. A Cancer Therapy: Results of Fifty Cases, Gerson Institute, California. Forbes, Alec, 1984. The Bristol Diet, Century.

Greenwald, P., 1996. Chemoprevention of Cancer. Scientific American, Special issue: What you need to know about Cancer, vol. 275, 3, pp. 96-100; and see also the World Health Organisation's International Agency for Research on Cancer website; http://who-pcc.iarc.fr/ and see also the British National Formulary, 1998.