Fogel, R. W. (1989). Without consent or contract: The rise and fall of American slavery. W.w. Norton.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFogel, Robert William. Without Consent or Contract: The Rise and Fall of American Slavery. W.w. Norton, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFogel, Robert William. Without Consent or Contract: The Rise and Fall of American Slavery. W.w. Norton, 1989.
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