John M. Kistler. Animals in the Military: From Hannibal's Elephants to the Dolphins of the U.S. Navy, Santa Barbara: ABC-CLIO (2011), p. 89, ISBN 978-1-59884-346-0 /wiki/ISBN_(identifier)
Konstantin Nossov. War Elephants, Osprey Publishing (2008), p. 16, ISBN 978-1-84603-268-4 /wiki/ISBN_(identifier)
Metropolitan Museum of Art http://www.metmuseum.org/collection/the-collection-online/search/679021