Wilson, Don E., and Sue Ruff, eds. 1999-01-01. The Smithsonian Book of North American Mammals. Smithsonian Institution Press. Washington, DC, USA. xxv + 750. 1-56098-845-2. .
Wilson, Don E., and DeeAnn M. Reeder, eds. 2005-10-01. Mammal Species of the World: A Taxonomic and Geographic Reference, 3rd ed., vols. 1 & 2. Johns Hopkins University Press. Baltimore, Maryland, USA. 2142. 0-8018-8221-4. .
Wilson, Don E., and DeeAnn M. Reeder, eds. 1992-01-01. Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing. Smithsonian Institution Press. Washington, DC, USA. xviii + 1207. 1-56098-217-9. Corrections were made to text at 3rd printing.
Wilson & Reeder, eds. (2005): Comments: Includes Boocercus, Limnotragus, Nyala and Strepsiceros; see Ansell (1972:20) and Van Gelder (1977a, b); except for T. buxtoni, all species have been made types of genera. Monophyletic lineages within the Tragelaphini have not been proposed on the basis of morphology, though Ansell (1972) allocated angasii and spekii to a superspecies. From gene analysis, there is a lack of evidence that Tragelaphus species form a clade excluding Taurotragus, and therefore Tragelaphus is regarded as paraphy...