found: Centennial summer [SR] 1976:spoken (Mark Stevens)
found: Filmlexicon, 1958,v. 6 (Mark Stevens, 1916- )
found: Halliwell's filmgoer's comp., 1988(Stevens, Mark; b. 1916; AKA Stephen Richards; American leading man, producer, director)
found: Internet movie database WWW site, October 24, 2008(Mark Stevens; b. December 13, 1916, Cleveland, Ohio; d. September 15, 1994, Majores, Spain; alternate names, Stephen Richards, Richards Steven; birth name, Richard William Stevens; actor, director, producer, writer)
found: IMDb, July 19, 2019:(Mark Stevens, actor, director, producer ; b. December 13, 1916 in Cleveland, Ohio, USA as Richard William Stevens ; d. September 15, 1994 (age 77) in Majones, Spain)
