Snyder, S. (2015). Shot down: The true story of pilot Howard Snyder and the crew of the B-17 Susan Ruth (First edition.). Sea Breeze Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSnyder, Steve. Shot Down: The True Story of Pilot Howard Snyder and the Crew of the B-17 Susan Ruth. First edition. Seal Beach, CA: Sea Breeze Publishing, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSnyder, Steve. Shot Down: The True Story of Pilot Howard Snyder and the Crew of the B-17 Susan Ruth. First edition. Sea Breeze Publishing, 2015.
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