Groucho: The Life and Times of Julius Henry Marx. 2000. ISBN 0-375-70207-5. Simon Louvish. Monkey Business: The Lives and Legends of the Marx Brothers. 2001
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slaveowners, The Washington Post, 2022-01-27 [2022-01-31], (原始内容存档于2022-09-20) Chambers, William Nisbet. Old Bullion Benton, Senator from the New West: