Foner, E. (2015). Gateway to freedom: The hidden history of the underground railroad (First edition.). W.W. Norton & Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFoner, Eric. Gateway to Freedom: The Hidden History of the Underground Railroad. First edition. New York: W.W. Norton & Company, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFoner, Eric. Gateway to Freedom: The Hidden History of the Underground Railroad. First edition. W.W. Norton & Company, 2015.
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