Wilson, Don E. & Reeder, DeeAnn M. (toim.): Rangifer tarandus caribouMammal Species of the World. A Taxonomic and Geographic Reference (3rd ed). 2005. Johns Hopkins University Press. Viitattu 3.2.2013. (englanniksi)
Wilson, Don E. & Reeder, DeeAnn M. (toim.): Rangifer tarandusMammal Species of the World. A Taxonomic and Geographic Reference (3rd ed). 2005. Johns Hopkins University Press. Viitattu 3.2.2013. (englanniksi)