National Geographic Society (U.S.), Dunn, J. L., & Alderfer, J. K. (2011). National Geographic field guide to the birds of North America (Sixth edition.). National Geographic Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Geographic Society (U.S.), Jon L. Dunn, और Jonathan K. Alderfer. National Geographic Field Guide to the Birds of North America. Sixth edition. Washington, D.C.: National Geographic Society, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNational Geographic Society (U.S.), et al. National Geographic Field Guide to the Birds of North America. Sixth edition. National Geographic Society, 2011.
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