Halls, K. M. (2013). Courageous canine!: And more true stories of amazing animal heroes. National Geographic Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHalls, Kelly Milner. Courageous Canine!: And More True Stories of Amazing Animal Heroes. Washington, D.C.: National Geographic Society, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHalls, Kelly Milner. Courageous Canine!: And More True Stories of Amazing Animal Heroes. National Geographic Society, 2013.
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