Ambrose, S. E., & Whitener, B. (2008). Undaunted courage: Meriwether Lewis, Thomas Jefferson, and the opening of the American West. Audioworks/Simon & Schuster Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAmbrose, Stephen E., और Barrett Whitener. Undaunted Courage: Meriwether Lewis, Thomas Jefferson, and the Opening of the American West. New York, NY: Audioworks/Simon & Schuster Audio, 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAmbrose, Stephen E., और Barrett Whitener. Undaunted Courage: Meriwether Lewis, Thomas Jefferson, and the Opening of the American West. Audioworks/Simon & Schuster Audio, 2008.
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