Não informado. (2001). Yearbook of the Massachusetts Audubon Society. Massachusetts Audubon Society.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Yearbook of the Massachusetts Audubon Society. Lincoln, Mass: Massachusetts Audubon Society, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Yearbook of the Massachusetts Audubon Society. Massachusetts Audubon Society, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.