Sterling, C.H. (2004). Encyclopedia of Radio 3-Volume Set. Taylor & Francis. p. 980. ISBN978-1-135-45648-1. Retrieved 20 May 2021. The first of these, in 1906, was to a Lucille Sheardown, a marriage thatended in divorce the same year.
History of Communications-Electronics in the United States Navy by Captain L. S. Howeth, USN (Retired), 1963, "The Radio Telephone Failure", pp. 169–172.
"What Everyone Should Know About Radio History: Part II" by J. H. Morecroft, Radio Broadcast, August 1922, p. 299: "[De Forest] took out a patent in 1905 on a bulb having two hot filaments connected in a peculiar manner, the intended functioning of which is not at all apparent to one comprehending the radio art."
"Special Land Stations: New Stations", Radio Service Bulletin, July 1915, p. 3. The "2" in 2XG's callsign indicated that the station was located in the 2nd Radio Inspection district, while the "X" signified that it held an Experimental license.
"Dr. DeForest, Father of Radio, Dead at 87" (AP), Pittsburgh Post-Gazette, July 2, 1961, p. 4: "Hollywood, California, July 1, 1961. Dr. Lee de Forest, 87, the so-called 'father of radio', died at his home here Friday."
