25, Issue 16, 2015, Pages 2158-2165. ^ a b Suvi Viranta, Anagaw Atickem, Lars Werdelin & Nils Chr. Stenseth, “Rediscovering a forgotten canid species.”
identification guide, (Paperback, 1985) p. 106, p.288. ISBN 0-395-60291-2. ^ a b Lars Svensson, Killian Mullarney, Dan Zetterstrom, Collins Bird Guide 2nd Edition