"Lang Jeffries Weds Gail Harris". The Terre Haute Tribune. August 14, 1966. p. 27. Retrieved December 24, 2019 – via Newspapers.com.
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Kinnard, Roy; Crnkovich, Tony (2017). Italian sword and sandal films, 1908–1990. Jefferson, North Carolina: McFarland. ISBN978-1-4766-6291-6. OCLC952390198.
Weisser, Thomas (2014). Spaghetti Westerns--the Good, the Bad and the Violent : a Comprehensive, Illustrated Filmography of 558 Eurowesterns and Their Personnel, 1961–1977. Jefferson, NC: McFarland. ISBN978-1-4766-1169-3. OCLC894938751.