Não informado. (1981). Colonial waterbirds. Colonial Waterbirds Society.
Chicago-viite (17. p.)Não informado. Colonial Waterbirds. De Leon Springs, Fla: Colonial Waterbirds Society, 1981.
MLA-viite (8. p.)Não informado. Colonial Waterbirds. Colonial Waterbirds Society, 1981.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.