4 literature references for Equus hemionus Pallas, 1775:

Author: Wilson, Don E., and DeeAnn M. Reeder, eds.
Year: 1992
Title:
Source: Mammal Species of the World: A Taxonomic and Geographic Reference, 2nd ed., 3rd printing
Author:
Year: 1998
Title:
Source: website, Mammal Species of the World
Author: Wilson, Don E., and F. Russell Cole
Year: 2000
Title:
Source: Common Names of Mammals of the World
Author:
Year: 2001
Title:
Source: website, U. S. Fish and Wildlife Service Endangered Species Program-05/01