Não informado. North American Fauna. Bureau of Sport Fisheries and Wildlife.
Chicago-viite (17. p.)Não informado. North American Fauna. Washington: Bureau of Sport Fisheries and Wildlife.
MLA-viite (8. p.)Não informado. North American Fauna. Bureau of Sport Fisheries and Wildlife.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.