Barabash-Nikiforov, I. (November 1938). "Mammals of the Commander Islands and the Surrounding Sea". Journal of Mammalogy. 19 (4): 423–429. doi:10.2307/1374226. JSTOR1374226.
Barabash-Nikiforov, I. (November 1938). "Mammals of the Commander Islands and the Surrounding Sea". Journal of Mammalogy. 19 (4): 423–429. doi:10.2307/1374226. JSTOR1374226.