1. Borgström, Georg, "The Transverse Reactions of Plants", 126–131 (Lund:C. W. K. Gleerup; Copenhagen:Ejnar Munksgaard; London:Williams and Norgate., Ltd., 1939).
2. Thompson, J. H., Holt, P. F., and Jones, R. Forbes, Nature, 151, 23 (1943).
3. Thompson, J. H., Brit. Med. J. (July 31, 1943).
4. Avery George, S., Jr., Buckholder, P. R., and Creighton, Harriet B., Amer. J. Bot, 24, 226 (1937).
5. Thompson, J. H., "Cancer Research", Medical World (Oct. 13, 1944).