Landau, H. (1937). The enemy within: The inside story of German sabotage in America. G.P. Putnam's sons.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLandau, Henry. The Enemy Within: The Inside Story of German Sabotage in America. [New York]: G.P. Putnam's sons, 1937.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLandau, Henry. The Enemy Within: The Inside Story of German Sabotage in America. G.P. Putnam's sons, 1937.
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