Joseph Adamson III. Groucho, Harpo, Chico and Sometimes Zeppo. 1973.
Wes D. Gehring. The Marx Brothers: A Bio-Bibliography. Westport, CT: Greenwood Publishing Group, 1987. ISBN 0313245479
Richard J. Anobile. Marx Brothers Scrapbook.
Harpo Marx, w/Rowland Barber. Harpo Speaks!. Bernard Geis Associates, 1961.
Fix, Charlene. Harpo Marx as Trickster. Jefferson, NC: McFarland & Company, 2013. ISBN 0786471476
|Moving Picture World (USA)||16 April 1921, pg. 738, "Marx Brothers in New Comedy Series ['Comedies without Custard']"|
|Maasstad Weekbladen (Netherlands)||9 December 2009, Vol. 15, Iss. 50, "The Marx Brothers 5 Filmklassiekers van dit kwartet"|
|Time (USA)||15 August 1932|
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