National Audubon Society, BirdLife International, Frances, P., & Burnie, D. (2007). Bird: The definitive visual guide (1st American ed.). DK Pub..
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Dyfyniad Arddull Chicago
National Audubon Society, BirdLife International, Peter Frances, and David Burnie. Bird: The Definitive Visual Guide. 1st American ed. New York: DK Pub., 2007.
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Dyfyniad MLA
National Audubon Society, et al. Bird: The Definitive Visual Guide. 1st American ed. DK Pub., 2007.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.