Barone, R. E. F. (2022). Unbreakable: The spies who cracked the Nazis' secret code (First edition.). Henry Holt and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBarone, Rebecca E. F. Unbreakable: The Spies Who Cracked the Nazis' Secret Code. First edition. New York: Henry Holt and Company, 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBarone, Rebecca E. F. Unbreakable: The Spies Who Cracked the Nazis' Secret Code. First edition. Henry Holt and Company, 2022.
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