Tham khảo Hughes_XF-11

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    Tài liệu

    • Barton, Charles. "Howard Hughes and the 10,000 ft. Split-S." Air Classics, Vol. 18, no. 8, August 1982.
    • Hansen, Chris. Enfant Terrible: The Times and Schemes of General Elliott Roosevelt. Tucson, Arizona: Able Baker Press, 2012. ISBN 978-0-61566-892-5.
    • Winchester, Jim. "Hughes XF-11." Concept Aircraft: Prototypes, X-Planes and Experimental Aircraft. Kent, UK: Grange Books plc., 2005. ISBN 978-1-84013-809-2.