Schmidle, N. (2021). Test gods: Virgin Galactic and the making of a modern astronaut (First edition.). Henry Holt and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchmidle, Nicholas. Test Gods: Virgin Galactic and the Making of a Modern Astronaut. First edition. New York, NY: Henry Holt and Company, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSchmidle, Nicholas. Test Gods: Virgin Galactic and the Making of a Modern Astronaut. First edition. Henry Holt and Company, 2021.
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