Madsen, A. (2001). John Jacob Astor: America's first multimillionaire. John Wiley.
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Tohutoru Kātū Chicago (17th ed.)
Madsen, Axel. John Jacob Astor: America's First Multimillionaire. New York: John Wiley, 2001.
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Tohutoro MLA (9th ed.)
Madsen, Axel. John Jacob Astor: America's First Multimillionaire. John Wiley, 2001.
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