Walvin, J. (2019). Freedom: The overthrowing of the slave empires (First Pegasus Books hardcover edition.). Pegasus Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWalvin, James. Freedom: The Overthrowing of the Slave Empires. First Pegasus Books hardcover edition. London ; New York: Pegasus Books, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWalvin, James. Freedom: The Overthrowing of the Slave Empires. First Pegasus Books hardcover edition. Pegasus Books, 2019.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.