Blum, H. (2014). Dark invasion: 1915: Germany's secret war and the hunt for the first terrorist cell in America (First Edition.). Harper.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBlum, Howard. Dark Invasion: 1915: Germany's Secret War and the Hunt for the First Terrorist Cell in America. First Edition. New York: Harper, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBlum, Howard. Dark Invasion: 1915: Germany's Secret War and the Hunt for the First Terrorist Cell in America. First Edition. Harper, 2014.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.