Ephraim Katz, et al: The Macmillan International Film Encyclopedia, London: Macmillan, 1998 (Third Ed.), pg. 839; Adrian Room Dictionary of Pseudonyms: 13,000 Assumed Names and Their Origins, Jefferson, N.C.: McFarland, 2010, p. 292; John Walker (ed) Halliwell's Who's Who in the Movies, London: HarperCollins, 1999, p. 255