Mohnhaupt, J. (2019). The zookeepers' war: An incredible true story from the Cold War (First Simon & Schuster hardcover edition.). Simon & Schuster.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMohnhaupt, Jan. The Zookeepers' War: An Incredible True Story from the Cold War. First Simon & Schuster hardcover edition. New York: Simon & Schuster, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMohnhaupt, Jan. The Zookeepers' War: An Incredible True Story from the Cold War. First Simon & Schuster hardcover edition. Simon & Schuster, 2019.
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