Tham khảo John Jacob Astor IV

  1. ↑ Federal Reserve Bank of Minneapolis Community Development Project. “Consumer Price Index (estimate) 1800–”. Federal Reserve Bank of Minneapolis. Truy cập ngày 2 tháng 1 năm 2019.
  2. ↑ “An Age of Splendor, and Hotel One-Upmanship”. New York Times. ngày 18 tháng 6 năm 2006. His younger cousin, known as Jack, enrolled in Harvard, left without a degree, traveled and joined 'about two dozen clubs.' He tinkered with inventions, married unwisely and, inspired by Jules Verne, wrote a work of science fiction. Often ridiculed in the press, he bore the sobriquet 'Jack Ass.'
  3. ↑ “Noted Men On The Lost Titanic. Col. Jacob Astor, with His Wife. Isidor Straus and Wife, and Benj. Guggenheim Aboard”. New York Times. Truy cập ngày 10 tháng 12 năm 2013. Following are sketches of a few of the well-known persons among the 1,300 passengers on the lost Titanic. The fate of most of them at this time is, of course, not known. Col. John Jacob Astor and Mrs. Astor, Isidor Straus and Mrs. Straus, J. Bruce Ismay, Managing Director of the White Star Line: Benjamin Guggenheim, and Frank D. Millet, the artist, are perhaps the most widely known of the passengers..... Chú thích có tham số trống không rõ: |coauthors= (trợ giúp)

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