Parsons. Captain Jack Helm. University of North Texas Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रParsons. Captain Jack Helm. University of North Texas Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रParsons. Captain Jack Helm. University of North Texas Press.
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