Maier, T. (2025). The invisible spy: Churchill's Rockefeller Center spy ring and America's first secret agent of World War II. Hanover Square Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMaier, Thomas. The Invisible Spy: Churchill's Rockefeller Center Spy Ring and America's First Secret Agent of World War II. New York, NY: Hanover Square Press, 2025.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMaier, Thomas. The Invisible Spy: Churchill's Rockefeller Center Spy Ring and America's First Secret Agent of World War II. Hanover Square Press, 2025.
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