Não informado. (2001). Yearbook of the Massachusetts Audubon Society. Massachusetts Audubon Society.
Citace podle Chicago (17th ed.)Não informado. Yearbook of the Massachusetts Audubon Society. Lincoln, Mass: Massachusetts Audubon Society, 2001.
Citace podle MLA (8th ed.)Não informado. Yearbook of the Massachusetts Audubon Society. Massachusetts Audubon Society, 2001.
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