Barger. Beyond the Call of Duty. The Kent State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBarger. Beyond the Call of Duty. The Kent State University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBarger. Beyond the Call of Duty. The Kent State University Press.
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