Weston, G. M. (1857). The progress of slavery in the United States. The Author.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWeston, George M. The Progress of Slavery in the United States. Washington, D.C.: The Author, 1857.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWeston, George M. The Progress of Slavery in the United States. The Author, 1857.
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