Prince, A. J., & Squier, R. (2014). Who was Frederick Douglass? Grosset & Dunlap, an imprint of Penguin Group (USA) LLC.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPrince, April Jones, और Robert Squier. Who Was Frederick Douglass? New York: Grosset & Dunlap, an imprint of Penguin Group (USA) LLC, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPrince, April Jones, और Robert Squier. Who Was Frederick Douglass? Grosset & Dunlap, an imprint of Penguin Group (USA) LLC, 2014.
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