Harkins. The Watchers in Jewish and Christian Traditions. Augsburg Fortress Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHarkins. The Watchers in Jewish and Christian Traditions. Augsburg Fortress Publishers.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHarkins. The Watchers in Jewish and Christian Traditions. Augsburg Fortress Publishers.
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