Não informado. (1961). Massachusetts audubon newsletter. Massachusetts Audubon Society.
Chicagoスタイル(17版)引用形式Não informado. Massachusetts Audubon Newsletter. South Lincoln, Mass: Massachusetts Audubon Society, 1961.
MLA(8版)引用形式Não informado. Massachusetts Audubon Newsletter. Massachusetts Audubon Society, 1961.
警告: この引用は必ずしも正確ではありません.