Behrans, R.H., Phillips, H.What Do Travellers Know About Malaria? Letter to The Lancet , 9.12.89.
2.
Curtis, C.F., White, G.B., Plasmodium falciparum transmission in England. Entomological and epidemiological data related to cases in 1983. J. Trop. Med. Hyg., 1984,87,101-114.
3.
International Health Regulations 1969. Third Annotated Edition 1983, World Health Organisation.
4.
The Travellers Guide to Health. T1 January, 1990. Dept. of Health and the Central Office of Information .