Douglas, R. (2015). Undaunted: [knights in black leather] (First edition.). William Morrow Paperbacks.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDouglas, Ronnie. Undaunted: [knights in Black Leather]. First edition. New York, NY: William Morrow Paperbacks, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDouglas, Ronnie. Undaunted: [knights in Black Leather]. First edition. William Morrow Paperbacks, 2015.
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