Robert S. Pinals: Theodore Roosevelt's inflammatory rheumatism. In: Journal of Clinical Rheumatology: Practical Reports on Rheumatic & Musculoskeletal Diseases. Band14, Nr.1, Februar 2008, ISSN1536-7355, S.41–44, doi:10.1097/RHU.0b013e3181639ad0, PMID 18431099.
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Edward P. Kohn (Hrsg.): A Most Glorious Ride: The Diaries of Theodore Roosevelt, 1877–1886. State University of New York Press, Albany 2015, ISBN 978-1-4384-5513-6, S. 220.
Paul Grondahl: I Rose Like a Rocket: The Political Education of Theodore Roosevelt. University of Nebraska Press, Lincoln 2004, ISBN 0-8032-5987-5, S. 145.
Charles Curry Aiken, Joseph Nathan Kane: The American Counties: Origins of County Names, Dates of Creation, Area, and Population Data, 1950–2010. 6. Auflage. Scarecrow Press, Lanham 2013, ISBN 978-0-8108-8762-6, S. XIV.
Roosevelt's "Please Put Out the Light" His Last Words, Says Witness of His End. In: The New York Times. 3. August 1926, ISSN0362-4331 (nytimes.com [abgerufen am 11. Dezember 2022]).
Smithsonian-Roosevelt African Expedition. In: National Museum of Natural History: Celebrating 100 Years. Smithsonian Institution, National Museum of Natural History, archiviert vom Original am 12. April 2013; abgerufen am 20. Juni 2013.
Smithsonian-Roosevelt African Expedition. In: National Museum of Natural History: Celebrating 100 Years. Smithsonian Institution, National Museum of Natural History, archiviert vom Original am 12. April 2013; abgerufen am 20. Juni 2013.
Roosevelt's "Please Put Out the Light" His Last Words, Says Witness of His End. In: The New York Times. 3. August 1926, ISSN0362-4331 (nytimes.com [abgerufen am 11. Dezember 2022]).
Robert S. Pinals: Theodore Roosevelt's inflammatory rheumatism. In: Journal of Clinical Rheumatology: Practical Reports on Rheumatic & Musculoskeletal Diseases. Band14, Nr.1, Februar 2008, ISSN1536-7355, S.41–44, doi:10.1097/RHU.0b013e3181639ad0, PMID 18431099.