↑ Grubb, P. (2005). "Order Artiodactyla". In Wilson, D. E.; Reeder, D. M. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. p. 676. ISBN 978-0-8018-8221-0. OCLC 62265494
↑ Estes, Richard D. (1999) The Safari Companion, Chelsea Green Publishing Company, Vermont, ISBN 0-7974-1159-3
