Pettigrew. Freedom's Debt. The University of North Carolina Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPettigrew. Freedom's Debt. The University of North Carolina Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPettigrew. Freedom's Debt. The University of North Carolina Press.
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