Não informado. (2003). North American Birds. American Birding Association.
Style de citation Chicago (17e éd.)Não informado. North American Birds. Colorado Springs, Colo: American Birding Association, 2003.
Style de citation MLA (8e éd.)Não informado. North American Birds. American Birding Association, 2003.
Attention : ces citations peuvent ne pas être correctes à 100%.