Não informado. (2003). North American Birds. American Birding Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. North American Birds. Colorado Springs, Colo: American Birding Association, 2003.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. North American Birds. American Birding Association, 2003.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.