Phillips, U. B. American Negro Slavery A Survey of the Supply, Employment and Control of Negro Labor as Determined by the Plantation Regime.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPhillips, Ulrich Bonnell. American Negro Slavery A Survey of the Supply, Employment and Control of Negro Labor as Determined by the Plantation Regime.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPhillips, Ulrich Bonnell. American Negro Slavery A Survey of the Supply, Employment and Control of Negro Labor as Determined by the Plantation Regime.
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