Collins, W. H. The Domestic Slave Trade of the Southern States.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCollins, Winfield H. The Domestic Slave Trade of the Southern States.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCollins, Winfield H. The Domestic Slave Trade of the Southern States.
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