- Groucho, Harpo, Chico and Sometimes ZeppoJoseph Adamson III · 1973
- The Marx Brothers: A Bio-BibliographyWes D. Gehring · Westport, CT: Greenwood Publishing Group, 1987 · ISBN: 0313245479
- Son of Harpo Speaks!Bill Marx · Boalsburg, PA: BearManor Media, 2007 · ISBN: 1593930623
- Marx Brothers Scrapbook
- Harpo Speaks!Harpo Marx, w/Rowland Barber · Bernard Geis Associates, 1961
- The Unknown Marx Brothers (1993)
- Slick Hare (1947)
- Hollywood Steps Out (1941)
- Mickey's Polo Team (1936)
- Groucho (1983)
- St. Louis Globe-Democrat (US)"Us Marx Boys By Harpo Himself"September 13, 1936 · Vol. 62, Iss. 117, pg. 2G · by: Uncredited
- The Times (GB)"Harpo Marx"September 30, 1964 · pg. 17:1
- Variety (US)"Harpo Marx"September 30, 1964 · pg. 63:1
- New York Times (US)"Harpo Marx, the Silent Comedian, Is Dead at 70; Blond-Wigged, Horn-Tooting Star Scored on Stage and in Films With Brothers"September 29, 1964 · pg. 1:2, 52:1
- Moving Picture World (US)"Marx Brothers in New Comedy Series ['Comedies without Custard']"April 16, 1921 · pg. 738
- Maasstad Weekbladen (NL)"The Marx Brothers 5 Filmklassiekers van dit kwartet"December 9, 2009 · Vol. 15, Iss. 50
- Time (US)August 15, 1932
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