Não informado. (2001). Yearbook of the Massachusetts Audubon Society. Massachusetts Audubon Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Yearbook of the Massachusetts Audubon Society. Lincoln, Mass: Massachusetts Audubon Society, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Yearbook of the Massachusetts Audubon Society. Massachusetts Audubon Society, 2001.
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