Dirck. Lincoln and the Constitution. Southern Illinois University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDirck. Lincoln and the Constitution. Southern Illinois University Press.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDirck. Lincoln and the Constitution. Southern Illinois University Press.
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