^ Sobel 1998a, p. 407.

^ Fuess 1940, pp. 450–455.

^ Sobel 1998a, p. 403; Ferrell 1998, pp. 201–202.

^ Fuess 1940, pp. 457–459; Greenberg 2006, p. 153.

^ Fuess 1940, p. 460.

^ Greenberg 2006, pp. 154–155.

^ Sobel 1998a, p. 410.

^ Greenberg 2006, p. 7.

^ Sobel 1998a, p. 252.

^ Williams, Emrys (1967). "The Presidential address". Radio and Electronic Engineer. 33 (1): 1. doi:10.1049/ree.1967.0001. ISSN 0033-7722.

^ de Forest 1924.

^ Mashon, Mike (November 3, 2016). "Silent Cal, Not So Silent | Now See Hear!". blogs.loc.gov. Retrieved February 9, 2019.

^ "Medal of Honor will be awarded to Lindbergh". UPI. May 23, 1927. Retrieved February 9, 2019.

^ Unknown (1927). "Lindbergh honored by President Calvin Coolidge". Periscope Film. Archived from the original on November 24, 2021. Retrieved February 9, 2019.

Works cited
External video Q&A interview with Amity Shlaes on Coolidge, February 10, 2013, C-SPAN Booknotes interview with Robert Sobel on Coolidge: An American Enigma, August 30, 1998, C-SPAN
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About Coolidge and his era
"Confirms Daugherty's Story of Coolidge's Second Oath". St. Louis Post-Dispatch. St. Louis, Missouri. Associated Press. 