Não informado. (2001). Yearbook of the Massachusetts Audubon Society. Massachusetts Audubon Society.
Chicago-Zitierstil (17. Ausg.)Não informado. Yearbook of the Massachusetts Audubon Society. Lincoln, Mass: Massachusetts Audubon Society, 2001.
MLA-Zitierstil (8. Ausg.)Não informado. Yearbook of the Massachusetts Audubon Society. Massachusetts Audubon Society, 2001.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.