Greenberg. The Worlds of James Buchanan and Thaddeus Stevens. Louisiana State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGreenberg. The Worlds of James Buchanan and Thaddeus Stevens. Louisiana State University Press.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGreenberg. The Worlds of James Buchanan and Thaddeus Stevens. Louisiana State University Press.
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