Ruelle, K. G. (2020). Surprising spies: And unexpected heroes of World War II (First edition.). Holiday House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRuelle, Karen Gray. Surprising Spies: And Unexpected Heroes of World War II. First edition. New York: Holiday House, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRuelle, Karen Gray. Surprising Spies: And Unexpected Heroes of World War II. First edition. Holiday House, 2020.
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