1. “Best of the Badmen” by Boyd Magers, Bob Nareau and Bobby Copeland (2005) features a page on Gerald (page 230) with a short biography and a recommended viewing list of his films and TV Westerns in which he was the “heavy”. Highly recommended. ISBN No. 978-0-944019-43-6. Contact Boyd Magers at 1312 Stagecoach Rd. SE, Albuquerque, NM 87123.
2. “TV Western Players of the Fifties: A Biographical Encyclopedia of All Cast Members in Western Series, 1950-1959”. Features a potted biography of Gerald. Written and compiled by Everett Aaker, published by McFarland in 1997.
3. “Encyclopedia of Early Television Crime Fighters”. Features a potted biography of Gerald. Written and compiled by Everett Aaker, published by McFarland in 2006.
4. The Macmillan International Film Encyclopedia also features a potted biography of Gerald on page 957 of this biographer’s version. Written and compiled by Ephraim Katz, published in 1994 by Pan Macmillan Ltd., London.