Marx Brothers films
the Warner Brothers story at snopes.com movies films
Urban Legends Reference Pages: Movies (A Night in Casablanca)
Internet Broadway Database entry on ''Animal Crackers'' production
Internet Broadway Database: Production Credits
Full description of ''Animal Crackers'' from Filmsite.org
Animal Crackers (1930)
''Duck Soup'' script from a fan's website
THE MARX BROTHERS - The Making of Duck Soup
Present at the Creation , an NPR story about the failure of Duck Soup and the success of the film that followed
NPR : 'A Night at the Opera,' Present at the Creation
Credit summary with "Four Marx Brothers" poster from a University of Illinois at Chicago website
Duck Soup
Review and scene-by-scene description from a film buff whose ad-supported website is recommended by Roger Ebert
Duck Soup (1933)
www.froola.com - Go in quickly.
Humor Risk web telia
The Marx Brothers HUMOR RISK
The Marx Brothers Marxology web telia
The Marx Brothers MARXOLOGY
Marx Brothers Night at the Opera Treasury
Marx Brothers - Night at the Opera Treasury
IMDb entry for ''The Big Store'' title
The Big Store (1941)
Film as Art: Review of Marx Brothers' segment of the film alaska website
Film as Art: Danél Griffin's Guide to Cinema
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