Wayne Koestenbaum The anatomy of Harpo Marx Berkeley, 2012 |
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Glenn Mitchell The Marx Brothers Encyclopedia London, 1996 |
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Edwin M. Bradley The first Hollywood musicals, A critical filmography of 171 features, 1927 through 1932 Jefferson, N.C., 1996 pp. 106-108 |
Jay Robert Nash, Stanley Ralph Ross The Motion Picture Guide, Volume I A-B 1927-1983 Chicago, 1985 |
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Paul Michael, editor in chief. James Robert Parish, associate editor The American movies reference book, The sound era Englewood Cliffs, N.J.,, 1969 |