Não informado. (1971). American birds. National Audubon Society.
Chicagoスタイル(17版)引用形式Não informado. American Birds. New York: National Audubon Society, 1971.
MLA(8版)引用形式Não informado. American Birds. National Audubon Society, 1971.
警告: この引用は必ずしも正確ではありません.