Kostyal, K. M., & Hamlin, D. (2010). Great migrations: Official companion to the National Geographic Channel global television event. National Geographic.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKostyal, K. M., और David Hamlin. Great Migrations: Official Companion to the National Geographic Channel Global Television Event. Washington, D.C.: National Geographic, 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKostyal, K. M., और David Hamlin. Great Migrations: Official Companion to the National Geographic Channel Global Television Event. National Geographic, 2010.
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