Não informado. (1981). Colonial waterbirds. Colonial Waterbirds Society.
Chicagoスタイル(17版)引用形式Não informado. Colonial Waterbirds. De Leon Springs, Fla: Colonial Waterbirds Society, 1981.
MLA(8版)引用形式Não informado. Colonial Waterbirds. Colonial Waterbirds Society, 1981.
警告: この引用は必ずしも正確ではありません.