Ambrose, S. E. (2005). Undaunted courage: Meriwether Lewis, Thomas Jefferson, and the opening of the American West. Simon & Schuster.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAmbrose, Stephen E. Undaunted Courage: Meriwether Lewis, Thomas Jefferson, and the Opening of the American West. Simon & Schuster, 2005.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAmbrose, Stephen E. Undaunted Courage: Meriwether Lewis, Thomas Jefferson, and the Opening of the American West. Simon & Schuster, 2005.
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