Berry, F. (2021). Northern spy (Center Point Large Print edition.). Center Point Large Print.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBerry, Flynn. Northern Spy. Center Point Large Print edition. Thorndike, Maine: Center Point Large Print, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBerry, Flynn. Northern Spy. Center Point Large Print edition. Center Point Large Print, 2021.
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