Foner, E., & Jackson, J. D. (2015). Gateway to freedom: The hidden history of the underground railroad (Unabridged.). HighBridge Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFoner, Eric, और J. D. Jackson. Gateway to Freedom: The Hidden History of the Underground Railroad. Unabridged. Minneapolis, MN: HighBridge Audio, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFoner, Eric, और J. D. Jackson. Gateway to Freedom: The Hidden History of the Underground Railroad. Unabridged. HighBridge Audio, 2015.
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