Birkelbach. A Cycle of the West. Bison Books, University of Nebraska Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBirkelbach. A Cycle of the West. Bison Books, University of Nebraska Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBirkelbach. A Cycle of the West. Bison Books, University of Nebraska Press.
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