1. Snyder WF, Bragaw CL (1986) Achievement in Radio: Seventy Years of Radio Science, Technology, Standards and Measurement at the National Bureau of Standards. U.S. Government Printing Office, Washington, D.C. National Institute of Standards and Technology Special Publication (SP) 555.
2. Howeth LS (1963) History of Communications-Electronics in the United States Navy. U.S. Government Printing Office, Washington, D.C. https://archive.org/details/historyofcommuni00howe
3. QST Magazine (1916) Cover of November 1916 issue. https://commons.wikimedia.org/wiki/File:November_1916_QST.djvu
4. Electrical World (March 3, 1906) Editorial. http://earlyradiohistory.us/1906reg.htm
5. Detector for very small alternating currents and electrical waves