1. Breinl : The Morphology and Life-history of Spiroch˦ta duttoni, No. 3, Annals of Tropical Medicine and Parasitology.
2. Breinl and Kinghorn: An Experimental Study of the Parasite of the African Tick Fever (Spirochceta duttoni), Memoir XXI of the Liverpool School of Tropical Medicine.
3. Dutton and Todd: The Nature of Human Tick Fever in the Eastern Part of the Congo Free State, Memoir XVII of the Liverpool School of Tropical Medicine.
4. A Note on the Structure of Spiroch˦ta duttoni;Stephens;The Lancet,1906
5. Perrin : A Preliminary Communication on the Life-history of Trypanosoma balbinnii Proceedings of the Royal Society, London, Series B, vol. lxxvi, p. 368. (A very suggestive similarity will be seen to exist between some of the forms described, by this author and those seen in Spiroch˦ta duttoni.)