* | June 10, 1890 New York City, New York, USA | |
† | July 26, 1964 Beverly Hills, California, USA |
John C. Tibbetts, James M. Welsh The Encyclopedia of Filmmakers, Volume Two New York, NY, 2002 |
Glenn Mitchell A-Z of Silent Film Comedy, An Illustrated Companion London, 1998 |
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Glenn Mitchell The Marx Brothers Encyclopedia London, 1996 |
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Martin J. Quigley (ed.) The Motion Picture Almanac, Big Stars in Big Pictures Chicago, Ill., 1929 |
Dave Kehr, An Eye for Talent, in: Filmcomment, nr. 1, 2012 pp. 12-13 |