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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/