Não informado. (1981). Colonial waterbirds. Colonial Waterbirds Society.
Cita Chicago Style (17a ed.)Não informado. Colonial Waterbirds. De Leon Springs, Fla: Colonial Waterbirds Society, 1981.
Cita MLA (8a ed.)Não informado. Colonial Waterbirds. Colonial Waterbirds Society, 1981.
Precaución: Estas citas no son 100% exactas.