Turtledove, H., & Dufris, W. (2007). Beyond the gap: A novel of the opening of the world (Unabridged.). Tantor Media.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTurtledove, Harry, और William Dufris. Beyond the Gap: A Novel of the Opening of the World. Unabridged. Old Saybrook: Tantor Media, 2007.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTurtledove, Harry, और William Dufris. Beyond the Gap: A Novel of the Opening of the World. Unabridged. Tantor Media, 2007.
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