https://www.loc.gov/?q=roosevelt%20river%20%20brazil&fi=subject&fa=partof:motion%20picture,%20broadcasting%20and%20recorded%20sound%20division

https://www.kshs.org/kansapedia/jaguar-rug/10370

https://www.history.com/news/the-amazonian-expedition-that-nearly-killed-theodore-roosevelt

https://academic.oup.com/maghis/article-abstract/19/2/52/1184944?redirectedFrom=fulltext

http://www.pbs.org/wgbh/americanexperience/films/into-the-amazon/

Millard, Candice. The River of Doubt. London: Little, Brown, 2006.

https://www.newspapers.com/image/76273169/?terms=river%2Bof%2Bdoubt

http://www.theodorerooseveltcenter.org/