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, Don E., and F. Russell Cole 2000-01-01. Common Names of Mammals of the World. Smithsonian Institution Press. Washington, DC, USA. xiv + 204. 1-56098-383-3. With contributions by Bernadette N. Graham, Adam P. Potter, and Mariana M. Upmeyer.
CITES 2007-02-02. Notification to the Parties, no. 2007/007. . . 6. . Available online via CITES Secretariat at http://www.cites.org/eng/notif/2007/E007.pdf.
Wilson & Reeder, eds. (2005): Status: CITES - Appendix III (Ghana); IUCN - Lower Risk (nt)
Wilson & Reeder, eds. (2005): Comments: Speke (1863) described and illustrated the 'nzoé' or 'water-boc' and reported in a footnote that Sclater had named the species Tragelaphus Spekii [sic], but this is insufficient to make Sclater the author of the name (Article 50.1.1, International Code of Zoological Nomenclature; International Commission on Zoological Nomenclature, 1999). Subspecific systematics from Ansell (1972:22)
David F. Mitchell, ITIS Data Development Specialist: CITES: Removed from Appendix III by Ghana, removed in accordance with CITES Article XVI, paragraph 3, effective May 03, 2007