Lawrence Lessing, Man of High Fidelity: Edwin Howard Armstrong,a Biography (Philadelphia, Lippincott, 1956). This book provides the most fascinating and thorough account of the life, work and accomplishments of Professor Armstrong. Originally published by the Lippincourt Company in 1956, it was published in a Bantam pocket book version in 1969. It details the start of his research into electronic communications from his childhood in Yonkers, NY, where he built his own radio set in the family attic, to his development of FM broadcasting. It also details his harsh struggles with the RCA Corporation and others to be fairly compensated for his work.
D. Erickson, Armstrong's Fight for FM Broadcasting: One Man vs. Big Business and Bureaucracy (University of Alabama Press, 1973)
The Legacies of Edwin Howard Armstrong (The Radio Club of America, 1990)
T. Lewis, Empire of the Air: The Men Who Made Radio (HarperCollins, 1991)
Schwartz, M. "Armstrong's invention of noise-suppressing FM [History of Communications]," Communications Magazine, IEEE , vol.47, no.4, pp.20-23, April 2009
Eltz, G. "The Armstrong Super-Regenerative Circuit" (Radio Directory and Pub. Co, 1922)
Lee, T. Time to Celebrate: A Century of Electronics. in IEEE Solid-State Circuits Magazine. November 12, 2014. Published on the occasion of the 100th anniversary of Armstrong's first patent.
R. McCaughey. A Lever Long Enough: a History of Columbia's School of Engineering and Applied Science Since 1864. Columbia University Press, 2014. Published on the occasion of the sesquicentennial of Armstrong's Alma Mater, he receives brief mention on pp.101-102.