Gracie, R., & Maguire, P. (2024). Comfort in darkness: The invisible power of jiu jitsu (First edition.). Dey St., an imprint of William Morrow.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGracie, Rickson, और Peter Maguire. Comfort in Darkness: The Invisible Power of Jiu Jitsu. First edition. New York, NY: Dey St., an imprint of William Morrow, 2024.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGracie, Rickson, और Peter Maguire. Comfort in Darkness: The Invisible Power of Jiu Jitsu. First edition. Dey St., an imprint of William Morrow, 2024.
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