Não informado. (1981). Colonial waterbirds. Colonial Waterbirds Society.
Style de citation Chicago (17e éd.)Não informado. Colonial Waterbirds. De Leon Springs, Fla: Colonial Waterbirds Society, 1981.
Style de citation MLA (8e éd.)Não informado. Colonial Waterbirds. Colonial Waterbirds Society, 1981.
Attention : ces citations peuvent ne pas être correctes à 100%.