Order Perissodactyla Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 629 636 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Diceros bicornis subsp. chobiensis Zukowsky 1965 Synonyms: Diceros bicornis subsp. somaliensis J. Allen 1914 .