"Orange River." The Columbia Electronic Encyclopedia, Sixth Edition. Columbia University Press., 2003. Answers.com 29 May. 2007. http://www.answers.com/topic/orange-river
books.google.com
Tonchi, Victor L.; Lindeke, William A.; Grotpeter, John J.: ”Groote Rivier”, Historical Dictionary of Namibia, s. 154. 2nd, Illustrated painos. Scarecrow Press, 2012. ISBN 978-0-8108-7990-4Teoksen verkkoversio.
Hans E. Beekman: Facing the Facts: Assessing the Vulnerability of Africa's Water Resources to Environmental Change. UNEP/Earthprint. ISBN 978-92-807-2574-2Teoksen verkkoversio. (englanniksi)
Shortridge, Guy Chester: The Mammals of South West Africa: A Biological Account of the Forms Occurring in that Region. W. Heinemann, 1934. Teoksen verkkoversio.
britannica.com
Cooks, Johann; Hattingh, Phillip S. ja Wellington, John W.: Orange Riverbritannica.com. Encyclopædia Britannica, Inc. Viitattu 10.9.2021. (englanniksi)
