Não informado. (2003). North American Birds. American Birding Association.
Chicago-Zitierstil (17. Ausg.)Não informado. North American Birds. Colorado Springs, Colo: American Birding Association, 2003.
MLA-Zitierstil (8. Ausg.)Não informado. North American Birds. American Birding Association, 2003.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.