1. Ackerknecht EH. The history of malaria. Ciba Symposia 1945; 7:38–63.
2. Nehemiah 2:7. Old Testament.
3. Lyons M. The colonial disease: a social history of sleeping sickness. Cambridge : Cambridge University Press, 1992.
4. Wilcox D. Ten who dared. Boston : Little Brown, 1977.
5. Hakluyt Society. Friar William of Rubruck—his journey to the court of Kahn Mongke. London : Haklut Society, 1990; 173 (SI):1253–1255.