As an actor, Crowley had a career in radio before he moved into films, where he was best known for his roles in The Mob (1951), The Edge of Night (1956), and April Love (1957).
^"Monday's Highlights"(PDF). Radio and Television Mirror. 13 (4): 43. February 1940. Retrieved February 19, 2015.
^ abcdefghiTerrace, Vincent (1999). Radio Programs, 1924–1984: A Catalog of More Than 1800 Shows. McFarland & Company, Inc. ISBN978-0-7864-4513-4. P. 67.
^Krey, Brian (Spring 2016). "Echoes of the Dark Knight: Remembering the all-too-brief radio career of Batman and Robin". Nostalgia Digest. 42 (2): 46–53.